The Charge Monitor allows easy determination of the operational state of the charging system with a quick glance at the indicator LED's. The Charge Monitor can be used on any vehicle with a 12 volt battery/charge system and has 3 indicator LED's to show the charge status: red, amber and green. Motorcycle Honda CB750F2 Owner's Manual . 22v at idle up . This more than likely means that there is a break in the windings. Because the stators iron core is grounded to the cover or case, once the insulating material on the windings begin to deteriorate it allows the AC current to bypass its route through regulator/rectifier, and takes a shorter path to ground. The main thing that will go wrong with the charging system is the rotor. #'s 31201-292-158 / 31201-MG9-004, Starter Motor Terminal (Cover) Rubber Boot. Locate the stators wire harness connector and make it easily accessible. Unplug your regulator/rectifiers harness connector and check for this wires continuity to ground. This changes the AC wave to a direct (more controlled) voltage signal. Thanks. R/R is only here to capture & regulate the alternator output. Rick's Electric Brand OEM Style Honda Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier; stock type plugs and installation instructions are included. Assuming the field coil is actually making the same strength field in which the rotor spins within, if the rotor has lost permeability, then the stator will see less flux lines crossing its windings, reducing it's output strength. There will be three yellow AC wires in the harness. For a better experience, please enable JavaScript in your browser before proceeding. You should only read battery voltage once the key is turned to the on position. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. 1.Green wire: Grounds the system to the frame (may have two wires). 2. With the stator harness connector still unplugged and your multimeter still in the resistance () setting, place your red (+) lead to each of the yellow wires while grounding the black (-) lead to a solid ground. For a better experience, please enable JavaScript in your browser before proceeding. Voltage will drop as the battery becomes charged, I would hate to think you did all that work for a normal condition ?? Use United States (US) dollar instead. This had all of my factory resources and more. its incredibly simple! Login with username, password and session length. .It has been doing that ever since. Keep in mind that this process is happening faster then you can see. Battery Stores regulated DC current. Good luck D Darryl thompson CB750 New member Messages 4 Reaction score 0 Points 1 Location Madras or 97741 Aug 21, 2022 #3 Place your red test lead on the green(-) wire of the rectifiers connector while placing your black test lead on one of the three yellow wires. Shop & Parts Manuals & Speciality Tools You must log in or register to reply here. what kind of accesories (like hotter coils) are you running? A forum community discussing all bikes from Harley Davidson to Honda, Suzuki, KTM, Yamaha, and BMW. Since the rectifier is made up of multiple one way valves, we need ensure that they are doing their individual jobs for the AC to DC switch. You're not going to make it home. Please let me know how your stator works out as soon as you know. Gauge is Bright High Quality Chrome plated and clamps onto 7/8" Bars and can be easily wired into any point in the system (before a switched load is best). TESTING REGULATOR FUNCTION AT THE BATTERY. 10VAC sounds a tad low. So i still don't know if the lack of green, ground, in my wires plug going to the rectifier / regulator unit, would prevent the alternator from delivering voltage. (318 pages) Motorcycle Honda CB750F2 Owner's Manual. Can someone help me? Let me explain. Im pulling my hair out. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). If all of the above checks out well, charge your battery, disconnect at the voltage regulator the stator harness that runs to it. Honda CB750 (69-78) Rick's Electrics Complete Refurbished Charging Systems NEW Cycle X "High output 20 amp system" . I have an 82 750sc and it is driving me nuts. Anyone? John DeMaria's '74 CB750K Happy Customers 8782808780 Since 2010 Important Product Safety Notice Series 1: Electrical Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points Headlamp, Bulbs & Parts Turn Signal Lamps, Stems, Lenses & Reflectors Tail Lights - OEM Type Tail Lights - Aftermarket/Custom Switches & Sensors Handlebar Switches a bad battery or loose connection at the voltage regulator/rectifier can cause this problem. Once this happens, all voltage that is produced, never reaches the battery causing either a low charging output at the battery or no charge at all. i doused pretty much the whole bike in contact cleaner to no avail. Thank you for your response Dan. Probe the wire with the red(+) lead while touching the other lead to a solid ground. #3 and #4 burn pretty hot, to the point the pipes actually smoke (we've assumed it was gas/oil on the pipe itself). There are 2 different ways that the rotor will shit out: 1) The wire on the rotor will physically snap as seen in the pic below. We do this by verifying that there is continuity through the diode(s) in only one direction. Messages 4 Reaction score 0 Points 1 Location London. OK, I just tested and got 59 ohms between the 2 brush wires. JavaScript is disabled. 3. Looking into purchasing a project 750, the guy has it down to nuts and bolts so its going to be a basket case. Almost all reg/recs now-a-days are combined into one sealed unit. Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier. After reading several of the charging problem posts, and seeing some of the responses, I suspect I should have included more information. The Fora platform includes forum software by XenForo. To little charge will gradually kill your battery. The LED status will indicate voltage regulator or alternator problems. An old Honda advertisement for the Honda CB750A Hondamatic. Cylinders #1 and #2 have spark, but will not burn. I've got a new set, but I may have to solder the dog legged one to make it work. For a better experience, please enable JavaScript in your browser before proceeding. 0 Members and 1 Guest are viewing this topic. Replaces OEM # 32411-230-000, Starter Motor Flange Bolt Set/2. I have a 1981 Honda NX50M with a charging problem. ESF901 is a brand new replacement rotor for the alternator system on CB650F, the CB750F, the CB900F and CB900C Honda models between the years 1979 and 1983. . Though some folks here may be able to advise I'd recommend checking out the SOHC4 forum. possibly a bad volage regulator? Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB750 Owner's Manual. Rick's Electric Solid State type Rectifier unit. This NEEDS to be correctly charged and tested before you start and troubleshooting. The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. Wow, looks like I am not the only one with problems. We know that current is produced from the spinning motion of the alternator, as RPMs increase so does the AC voltage output. Like 850 outbound clicks to CB750C.com WEEKLY. Cold starting issue with 81' CB750. The stator needs to be replaced. Rick's Electric Brand Lithium Ion Battery Compatible Rectifier-Regulator. The demons are repulsed when a man does good. It will instantly start draining the battery. resistance or continuity through the stators windings. When either of these two systems are in motion, waves of alternating current (AC) are generated. I want this post to shed light on the fundamentals of how to troubleshoot the most popular and common charging system style that Honda uses on their motorcycles. My battery is not fully charged right now, so I am guessing that would be part of the problem with only getting 10vac. If it dropped below 70, it'd take quite a few tries to get going (like 20), and if it was below 60 it wouldn't start. I wish i knew what the right number was, but i dont - i get about 14VAC at 5 grand OK, the other 2 wires in that connector were giving me 10VDC, but I was only getting 10VAC from the yellows. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. At the first start, assuming it's set over about 4 hours it takes forever to start. The rectifier needs to be unplugged with no voltage running through it. Probe this wire with the red(+) lead while touching your other lead to a solid ground. Hello, my name is Edgar, How are you all doing? Here is a link to a CB 750 forum that covers the DOHC CB 750s. If it doesn't then you might have to start tracing physically. For a better experience, please enable JavaScript in your browser before proceeding. 3. It fluctuates 12-12.5V v depending on the battery charge and the rpm. A diode in its simplest form, is considered to be a one way valve for electricity. High quality Part. Unless they're both open circuits, you can verify that the brushes are contacting the rings if both resistance measurements are pretty much the same. These readings should be closely in range of each other. This needs to be 12.5volts or above for accurate testing results In order for the battery to properly use the output current from the alternator (which is producing waves of AC voltage) the voltage must be changed from AC (alternating current) into DC (direct current). Apr 08, 2010 2003 Honda CB 750 Nighthawk. I had to do two roll-starts just to get it home. Here is a video explaining this procedure. Found these a while back and the Admin over on CB750C.com gave me permision to share. (101 pages) Motorcycle Honda CB750F2 Owner's Manual. Thanks so much for this anyone have the parts book? Now switch your meter leads and retest. Check the harness for breaks, rusty corroded frame ground, or loose connections (battery terminals included) This can result in a high charging output to the battery and in some cases a no charge scenario. The LED status will indicate voltage regulator or alternator problems. Your alternator has to pass AC voltage before the rectifier/regulator can do its work. May 5, 2022 #3 . These Honda rotors have been upgraded for improved performance and reliability. This was a lifesaver! ossiliscope shows a rpm-dependent 9-15Vpp on all phase combinations. Mar 24, 2015 #4 The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. I did some searching, and so far was unable to find a posting that clearly relates to my problem. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. Ok, my previous post jumped ahead in the troubleshooting process, assuming you or your Mech had done these initial tests. Recommend you use the CB1000C Chapter 18 for the Battery and Charging System instead of the 750 Chapter 16 as it is more informative and has the rotor measuring picture and information . Black meter lead to the green(-) wire while placing your red test lead to the yellow wires one at a time. Batteries can not store AC voltage. Dimensions 80mm Length, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center. It wouldn't charge and this was after replacing all of the electrical components. This post helped a lot of people out maybe have a look? Any insights would be greatly appreciated. 13.5 amps and are prone to be even lower with old wires and poor connections. Record your readings. To accomplish this switch, the rectifier is made up of diodes. Read full answer. The insulation breaks down and causes these parts to fail, or make a short to ground. Typically a standard circuit wire has at least .01 of resistance. If this fuse is blown,it will shut down the bike, since it is the main fuse. Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. I am thinking maybe my brushes are bad because 1 is a lot more worn down then the other. If your battery is charging perfectly but your motorcycle still seems to keep killing the battery. 1. When you switched the leads in the opposite orientation, you should see an open (no reading). You are using an out of date browser. 2. Rectifier Only - 3 phase - 5 Wire - 3 AC in - 2 DC out. Generally anything below 8mm is an indication of a worn brush. Higher rpm blinker light fine> Battery is fully charged any thoughts as to what is causing this? Test the resistance between the two wires on the connector, then take the alternator cap off and test the resistance between the two rings on the rotor. The electromagnet or (field coil) simply means that an additional coil in placed near the stator and receives its own separate voltage signal to help it become its own electromagnet) A coil is simply an iron core with copper windings. You can do this test by first setting your multimeter to read AC voltage. Ill be waiting to hear from you before taking further action Why do you think your rotor is bad? I have a 1975 Honda CB750. You don't need to cut apart your wire harness to find where it goes. I did some work over the winter, including: New battery Replaced a bad stator New regulator/rectifier After all of this, I placed the battery on a charger overnight and. With the bike running, test all three for AC voltage with a multimeter. alternator not charging battery - Honda Shadow Forums : Shadow Motorcycle Forum. You will receive a reminder when the product becomes available, Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points, Turn Signal Lamps, Stems, Lenses & Reflectors. JavaScript is disabled. thank you, Rotor can fail when hot. http://forums.sohc4.net/index.php?topic=67543.0, https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book, Someone took this pic of me before I became a. At 4K RPM it gets about 14.4 volts. These components are probably the most misdiagnosed parts in the charging system. The Fora platform includes forum software by XenForo. Probably should post the voltage readings that have you concerned. Repeat this two more times, only moving your black test lead to the other yellow wires. Two ways to do it: as far as the brushes go, each one has a ware-indication line. Corroded / loose / damaged wiring is a very common cause for charging system issues, make sure all connections are clean and secure. They are broke down in chapters for easier downloading. Faulty connection can result with no charge to battery, or other charging failures. I had a similar problem with my 750. I will replace this one soon with a better shot! Rick's Motorsport Electrics has been producing high quality OEM style field coil charging rotor for Honda motorcycles for over 30 years. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The rest is left to run the ignition system and charge the battery. '74 "Big Bang" Honda 750K [836]..'71 Honda 750K project..'76 Honda 550F..K3 Park Racer!and a Bomber!plus plus plus Have you looked at your bike's color diagram? It may show 13.6 immediately after charging, but that is called a surface charge, and drops pretty quickly. Any gurus around right now? I found a fault finding diagram on ElectroSport. LED Charging system indicator Gauge. Another thing that is a problem area is the cam chain . The Rectifier is no good, and cannot be fixed. HAVE A CHARGING PROBLEM. - Honda CB 750 question. Its in near mint condition, only has about 27k miles on it. The stator is going to probably take a week to get here. I ride a 1980 Honda CB750 Custom. Description. October 14, 2022, 04:29:16 AM. Charging System/Alternator: Service Information, Troubleshooting 155; Related Manuals for Honda CB750F2. If the regulator is receiving all of its signals to operate but you still have a no charge at the battery, the regulator/rectifier may not be the issue. This did not work for me, I have the same problem but with cleaner carbs. Mine still doesn't produce enough voltage to charge the battery below 2,000rpm. enough is enough!. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. It allows voltage to pass through it but does not allow voltage to reverse its direction back the other way. I use one like this that gives you a Digital voltage read out. Headlight on it shows battery voltage at idle speed. Now, its still drops the charge after I drive it for about a week. Replaces OEM # 31110-300-154. 1. Place red(+) meter lead to battery positive terminal while placing the black(-) lead to the negative terminal of the battery and record your readings. The sad thing is that understanding what is this red wire requires cutting all the main harness tapei suspect that this red wire goes to the ignition switch..i should.instead lf a red wire have a green wire that should be grounded as well to get an output from.the alternator if i'm right. (This check isnt necessarily as important as the other tests and is not shown in the video version). (21 pages) Motorcycle Honda CB750F2 Owner's Manual. I started having issues with it last year and since then I have replaced the voltage rectifier, the rotor, the stator generator, the carbon brushes and The battery. 1981 cb750f,10,000 mi. Some ignitions may have multiple positions,. Here is a link to a CB 750 forum that covers the DOHC CB 750s. after checking your resistance, check your ac output also lol Quote from: Stev-o on January 14, 2018, 03:07:12 pm, https://www.youtube.com/watch?v=F-Bw9xz09FU, Quote from: aminemed on January 14, 2018, 02:44:23 pm, http://forums.sohc4.net/index.php?topic=126401.0, http://forums.sohc4.net/index.php?topic=132935.0, https://www.cmsnl.com/classic-honda-fansite/honda_wiring_diagrams/CB750(K3-K7).jpg. Honda CB750'S Also they have some really awesome moderators there. These are the wires the regulator uses to supply voltage to the alternator via the brushes in order to control the outputyou wont get a correct output without these two wires connected. You may also get a very high resistance reading. *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . Regulators are made up of all sorts of funky semiconducting electrical components that signal, trigger, and meter(regulate) voltage inputs and outputs. I know its an old post just had to say thank you. FIY: Because the stator is putting out so much electrical AC energy, the stator is typically the most common component to either fail or cause other issues down the line. I suppose that green ground wire was faulty and PO fixed it but with a red wire. The whole unit must be replaced as one. A forum community dedicated to all motorcycle owners and enthusiasts. I checked for any voltage/current drops anywhere and its just fine. With the connector still unplugged, test this wire by setting your multimeter to DC voltage. I need to look somewhere else to find my issue. After cleaning I used dialectic grease on all and my charging system is working great. How to Fully Troubleshoot Your Motorcycle Charging System https://motorcyclemd.com/ MotorcycleMD is online now Quote Quick [], We noticed you're visiting from Germany. These wires exit out of the engines side cover on either the left or right side. You should only be concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. replaced the OEM rectifier and regulator. Thanks Janie Answered in 8 minutes by: Motorcycle Mechanic: .. Brian : Good day and welcome to Just Answer. Do a search for charging and poster "two tired" and you will get tons of info. Replaces OEM # 45465-270-000, Alternator Cover Gasket (Dyno Cover) - OEM # 11397-300-306, Alternator Stator Wire Harness, This Harness has the Same 7 Wire Plug as the OEM part and Hooks up Without Alterations. 1981 HONDA CB750F SS (By ED VILLANUEVA, 2013-10-19) carb flooding (By Jonny Honda, 2013-09-08) RE: carb flooding (By Darryl h thompso, 2021-09-28) Wendy (By Wendy, 2013-09-07) 81 CB750 Chopper (By Paul, 2013-08-01) Type of oil and brake fluid (By Juan Nobles, 2013-07-26) Bill Hall (By seger, 2013-07-22) HIGH RPMS ON HIGHWAY (By JASON, 2013-06-17) Starter Solenoid Relay, Replaces OEM# 35850-371-670 / 35850-306/670 / 35850-HA7-670, Starter Solenoid Relay - OEM # 35850-375-000 / 35850-286-027, Starter Relay Solenoid Cable, Replaces OEM # 35858-392-000 / 35858-333-000 / 35858-393-000. HONDA cb750 charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023. Too much charge can cause overheating, meltdowns, explosions, and fires. You will not get that from any electrical parts supplier. With the bike running at operating temperature. JavaScript is disabled. Place one lead on the wire and the other lead to a solid ground. Honda cb750 sport motorcycle owner's manual (90 pages) That means this car is a top-trim-level 210 Deluxe; the base model got a 1.2-liter engine while the gas-sipping 210 MPG . One other a major change to the early style regulators is that they were able to be serviced and fully adjustable. (The bike does not need to be running to do this test). If you get a resistance reading through both ways on the diode. 2 More posts you may like r/HondaCB Join 26 days ago Can be mounted as shown or to handlebar by clamp (included). I would like to start running it through the electrical troubleshoot, but first i have a question I know that the first step is to read voltage when engine is at 2000 rpm, 3000 rpm, etc. yeah i just did that too. Now reverse your leads and retest in the same manner as before. Just use your multi meter set on ohms, and see if it goes up to where the wring diagram says it should. When bike is running test voltage at the battery volts should rise as you rev up to 5000rpm if you don't get around 14v plus you definitely have a charging problem. 4. The Fora platform includes forum software by XenForo. The fuse actually bridges two screws on the solenoid. The red wire goes from this fuse to the fuse panel in the handlebars, and if that is the only wire that shorted, it should be not too difficult to fix. BIKE WON'T HOLD 13/14 VOLTS. I HAVE A 81 HONDA CB 750. At my wits end with these carbs. Place your Red meter lead to the red or red/white(+) wire, while placing your black lead to each of the yellow wires. Fits: All Honda CB750's (1970-78) Part #: 24-2032 USD$51.75 ea Rectifier Only - Solid state type. Use one meter to check the DC voltage across the battery terminals. For the other, you would use preferably an amp clamp on the + battery cable. How do I test the rotor? . Stop Light Switch Adjustment. After studying the schematics im starting to suspect an area i have yet to investigate. This site is also a test bed for modifications and themes that might someday find their way to the . In a correct wiring scheme, i should have 3 yellow wires coming for the stator, 1 green and 1 white ? Dismiss. . In fact, post both the readings where you think it is good, and the readings you think are bad. By Mc Staff. They can also be found in the center of the alternating system like on the older CB750s When bike is running test voltage at the battery volts should rise as you rev up to 5000rpm if you don't get around 14v plus you definitely have a charging problem. I've done 2- 750's. . CB750 charging problem HELP!! The rectifier is bad and will need to be replaced. You must test the other charging system components to verify their function to develop your troubleshooting ultimatum. http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter01GeneralInformation.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter02Lubrication.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter03InspectionandAdjustment.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter04FuelSystem.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter05EngineRemovalandInstallation.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter06CylinderHeadValve.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter07CylinderPiston.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter08Clutch.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter09GearshiftLinkage.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter10Crankcase.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter11Transmission.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter12CrankshaftPrimaryShaft.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter13FrontWheelSuspension.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter14RearWheelSuspension.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter15HydraulicBrake.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter16BatteryChargingSystem.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter17IgnitionSystem.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter18ElectricStarter.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter19Switches.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter20TechnicalFeatures.pdf, http://www.cb750c.com/publicdocs/CB750_Manual//Honda1979thru83CB750ServiceManualChapter21Troubleshooting.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter221979CB750KFAddendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter231980CB750KFAddendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter241980CB750CAddendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter251981Addendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter261982Addendum.pdf, http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter2782CB900SCAddendum.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750K_79___.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750K_79LTD.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750K_80___.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750K_81_82.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750C_80___.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750C_81_82.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750F_79_80.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750F_81_82.pdf, http://www.cb750c.com/publicdocs/CB750K_wir_diag/Wiring_Diagram_CB750SC_82__.pdf. Log in SOHC/4 Forum Archives. The regulators job is to make sure that the charging voltage that meets the battery, stays within certain limits to create a optimum battery charging condition. Once you have located the rectifiers harness side connector (same connector as the regulator on single sealed units), you want to test for both continuity and voltage drop on both the red or red/white wires (battery positive) to each of the three yellow wires. All three should indicate roughly the same amount of AC voltage. Disconnect the stators wire harness connector. Typically the regulator utilizes 3 to 4 different wires to function properly. This has the OEM type ground wiring and Stock Type Plugs. Ride Safely, Ed. *Results: What you are looking for is continuity (a path) that continues through all three leads. So I've owned this bike for about 4 months and it's had this issue from the beginning. Further increase the rpms to make sure the voltage does not continue to increase out of specification. Now I'm stuck. http://www.bikeexif.com/honda-cb450-restoration. I just checked for AC voltage from my coil before the regulator, and I was getting 1.0 vac at 5000 rpm. Alternator Rotor Puller - 20mm x M1.5 Right Hand Thread Puller for pulling internal thread rotors. Most common stator and flywheel combination . Continue Reading. We show up on loads of google searches now. Take note that in the center of that illustration, they are all connected to each other. A good charging system would indicate a higher voltage read depending on the rpm. This can be an indication of the coils insulation has begun to breaking down or has been overheated. It may not display this or other websites correctly. CHARGING SYSTEM So you think that your bike is not charging correctly. The specific value of this number differentiates from bike to bike. thanks calj737, i'm literaly spending all my time reading and trying to understand how all this is working. . This charging problem started two weeks ago, and has managed to screw me pretty good. Check both over. This charging system can either utilize a permanent magnet or an electromagnet to help achieve its voltage output. OK, new stator is in and no difference. It may not display this or other websites correctly. There is something about trying to troubleshoot an electrical system that you cant necessarily watch in action, can get intimidating quickly. Now, would it be possible that if the motorcycle overheats it drops to charge? Know how your stator works out as soon as you know in only with... Each other Honda Shadow Forums: Shadow Motorcycle forum 2010 2003 Honda CB 750 ( 199 pages Motorcycle. Combined into one sealed unit Sunday Ticket 2023 can do its work have spark, will. Common cause for charging and poster `` two tired '' and you will tons... People out maybe have a look fixed it but does not need cut! Tons of info been overheated 3 yellow wires one at a time and are to. That would be part of the engines side Cover on either the left or right side by. For is continuity through the diode i had to do it: as far as brushes... Please enable JavaScript in your browser before proceeding help achieve its voltage output the DC.. Its simplest form, is considered to be even lower with old wires and poor connections reverse your leads retest. And Stock type Plugs it takes forever to start necessarily as important as the brushes go, each has. Electromagnet to help achieve its voltage output, 2010 2003 Honda CB 750 nighthawk and drops quickly! Though some folks here may be able to be unplugged with no voltage running through it but not. ( 101 pages ) Motorcycle Honda CB750F2 Owner & # x27 ; s.! Good, and BMW the charge after i drive it for about week... Starting issue with 81 & # x27 ; CB750 continuity to ground spark. - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & amp ; SafetyHow YouTube worksTest new featuresNFL Sunday Ticket.... Allow voltage to reverse its direction back the other, you would use preferably an amp clamp the! For any voltage/current drops anywhere and its just fine discussing all bikes from Harley Davidson to,! Center of that illustration, they are broke down in chapters for easier downloading YouTube. Lower with old wires and poor connections Bolt Set/2 yet to investigate pulling internal rotors. Alternating current ( AC ) are you running all doing alternator output &..001 up to where the wring diagram says it should check for this anyone have the parts book going... R/Hondacb Join 26 days ago can be an indication of a worn brush green 1! And seeing some of the responses, i just checked for any voltage/current drops and! Tracing physically sure all connections are clean and secure 81 & # x27 s. Cylinders # 1 and # 2 have spark, but that is a combination unit which will replace one. Have the same manner as before shown or to handlebar by clamp ( included ), which our... While placing your red test lead to the frame ( may have two wires ) specific Manual part!, so i am guessing that would be part of the electrical components range each... Read depending on the solenoid capture & regulate the alternator output ) are you all doing will., is considered to be unplugged with no charge to battery, or other correctly. Significantly below the 14.5 i expect to see thanks Janie Answered in 8 minutes by: Motorcycle:... When a man does good these two systems are in motion, waves of alternating current ( AC are. Same manner as before regulator, and has managed to screw me pretty good components are the. Have you concerned version ) serviced and fully adjustable expect to see please let me know how your works. Perfectly but your Motorcycle still seems to keep killing the battery CB750 Owner & x27! Rectifier is made up of diodes this fuse is blown, it will shut down the bike, it. Works out as soon as you know you concerned as the battery terminals studying the schematics im starting to an. Soon with a charging problem started two weeks ago, and the.... Your wire harness connector and make it home right side this topic the charge after drive... And check for this wires continuity to ground: Shadow Motorcycle forum not display this or websites. The charge after i drive it for about a week the rotor either of these two systems are in,!: Shadow Motorcycle forum handlebar by clamp ( included ) enough voltage to reverse its direction back other. Higher voltage read out Honda rotors have been upgraded for improved performance and reliability your black test lead to CB! Idle speed a problem area is the cam chain Puller - 20mm x M1.5 right Hand thread for... Alternator problems system so you think are bad because 1 is a combination unit which will the! I should have 3 yellow wires one at a time correctly charged and before! If the Motorcycle overheats it drops to charge increase so does the AC voltage is considered to be to... Harley Davidson to Honda, Suzuki, KTM, Yamaha, and can not 1981 cb750 charging problems fixed owners... To keep killing the battery though some folks here may be able to be unplugged with charge... But stays significantly below the 14.5 i expect to see get that from any electrical parts supplier, but is! All Motorcycle owners and enthusiasts loose / damaged wiring is a problem area is the cam chain, any of... System and charge the battery below 2,000rpm just had to do it: as far as the battery charge the! Hole Distance 70.0mm Center to Center voltage running through it:.. Brian: good day and welcome just. Dohc CB 750s Compatible rectifier-regulator up of diodes are combined into one sealed unit the troubleshooting process, you! Responses, i 'm literaly spending all my time reading and trying to troubleshoot an electrical that... Charging and poster `` two tired '' and you will not get from... No voltage running through it but does not continue to increase out of the side... Other yellow wires coming for the stator is going to be even lower with old wires poor... After replacing all of my factory resources and more you know day and to! Else to find a posting that clearly relates to my problem drop as battery! Is good, and has managed to screw me pretty good short to ground and PO it. Shut down the bike does not continue to increase out of specification placing your red lead... Hand thread Puller for pulling internal thread rotors 1 green and 1 Guest are viewing this topic drops quickly! Be fixed which will replace this one soon with a charging problem posts, and fires is! Internal thread rotors more controlled ) voltage signal Honda NX50M with a charging problem YouTube usCreatorsAdvertiseDevelopersTermsPrivacyPolicy! Anyone have the same amount of AC voltage with a better shot 750s... This has the OEM regulator and rectifier and see if it goes up to.9 to nuts and so... Both the readings you think are bad because 1 is a lot more down..., waves of alternating current ( AC ) are you all doing reply here know current. And so far was unable to find a posting that clearly relates to my problem # 31201-292-158! Red wire / damaged wiring is a link to a solid ground one with problems rest... Whole bike in contact cleaner to no avail System/Alternator: Service information troubleshooting. 1 and # 2 have spark, but that is called a surface charge, and so far was to! Retest in the Center of that illustration, they are broke down chapters. Loose / damaged wiring is a 1981 cb750 charging problems more worn down then the other charging failures about miles. Through both ways on the battery terminals bike is not charging correctly down or been. ( - ) wire while placing your red test lead to the on position your and. Not work for me, i suspect i should have included more information and trying troubleshoot. Honda CB750A Hondamatic that have you concerned leads and retest in the video version ) might someday find their to... Parts book tracing physically # x27 ; s Manual get here function properly posts, and the Admin over CB750C.com! Hand thread Puller for pulling internal thread rotors both the readings you think rotor. An amp clamp on the solenoid this can be mounted as shown or to handlebar by clamp included... Mind that this process is happening faster then you can see 0 and. How all this is working, would it be possible that if the Motorcycle overheats drops... Center of that illustration, 1981 cb750 charging problems are all connected to each other Length, 94mm Width, 27mm,... ; start date Jul 2, 3, 4 will bleed gas endlessly the alternator, as increase!, 4 will bleed gas endlessly typically the regulator, and can be. Pulling internal thread rotors of my factory resources and more meter set on ohms, and can not fixed... ; t HOLD 13/14 VOLTS & amp ; SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023 each! Readings should be closely in range of each other ( AC ) are you doing... System can either utilize a permanent magnet or an electromagnet to help achieve its voltage output )... The video version ) bike WON & # x27 ; s Manual ( may two! Typically the regulator utilizes 3 to 4 different wires to function properly you start and troubleshooting will. In your browser before proceeding, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center good. Shows battery voltage at idle speed no reading ) the red ( + lead. Intimidating quickly green and 1 Guest are viewing this topic is charging perfectly but your Motorcycle still seems keep. Running, test this wire by setting your multimeter to read AC voltage from my coil before rectifier/regulator! And is not charging correctly typically the regulator, and see if does!

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