The rest is left to run the ignition system and charge the battery. 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. 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. This is really getting frustrating. Ill be waiting to hear from you before taking further action Why do you think your rotor is bad? The rectifier is bad and will need to be replaced. I think the break even point for me (not charging or discharging) is around 3000-3500 rpms. Do this with all three of the yellow wires. 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. They are not serviceable, and if a problem is found with either systems. If the windings have developed a short to ground, you will see some type of resistance number. These components are probably the most misdiagnosed parts in the charging system. The LED status will indicate voltage regulator or alternator problems. Remember, this is AC so you don't want frame ground on the meter while testing. Dimensions 80mm Length, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center. Since AC current is alternating back and forth from positive to negative in its own waveform. 1981 HONDA CB650Z / A - chain drive 1981 HONDA CB750F/F2 . HAVE A CHARGING PROBLEM. If you discover that you have and open (no numeric value) or a excessively high reading. Place your red(+) lead to one of the yellow stator wires and place the other lead to a different yellow wire in the connector. , Pre 1980, some bikes used these two systems as separated units. concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. High quality Part. Issues with DOHC CB750 Carbs? 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. I suppose that green ground wire was faulty and PO fixed it but with a red wire. The LED status will indicate voltage regulator or alternator problems. JavaScript is disabled. The stator is going to probably take a week to get here. 3. (The bike does not need to be running to do this test). 3. The charging system voltage gradually drops off as the engine heats up. These readings should be closely in range of each other. Probe this wire with the red(+) lead while touching your other lead to a solid ground. 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. I ride a 1980 Honda CB750 Custom. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. I have a 1975 Honda CB750. 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. You should soon discover what modifications the PO made and where your problem lies. TESTED ALTERNATOR SEEMS TO BE WORKING Ask an Expert Car Questions Motorcycle Questions I HAVE A 81 HONDA CB 750. Can be mounted as shown or to handlebar by clamp (included). Battery: This is a huge part of your charging system. Battery Stores regulated DC current. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. The stator needs to be replaced. *Results: This test is to ensure that there are no breaks in that coils wire or any excessive resistance. I've got a new set, but I may have to solder the dog legged one to make it work. Honda CB750'S Also they have some really awesome moderators there. . how old is the battery? The stators and rotors go out all the time. It may not display this or other websites correctly. Start your motorcycles engine and place your red (+) lead to either one of the three yellow wires by back probing into the connector. In a correct wiring scheme, i should have 3 yellow wires coming for the stator, 1 green and 1 white ? 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. Well let's take a look. The insulation breaks down and causes these parts to fail, or make a short to ground. Rick's Motorsport Electrics has been producing high quality OEM style field coil charging rotor for Honda motorcycles for over 30 years. Now, would it be possible that if the motorcycle overheats it drops to charge? CB750 charging problem HELP!! After studying the schematics im starting to suspect an area i have yet to investigate. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. Plus he offers a LIFETIME WARRANTY. Come join the discussion about performance, reviews, racing, touring, modifications, classifieds, troubleshooting, maintenance, and more! It fluctuates 12-12.5V v depending on the battery charge and the rpm. May require a custom mounting job. 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 Rectifier Only - 3 phase - 5 Wire - 3 AC in - 2 DC out. I use these almost everyday Im on the job. The type charging system that I will be covering is the system that is most commonly used on the majority of mid-range and larger displacement bikes from Honda ( 1970 models and into present day, with some having slight qwerks ) This type of system is called a Three phase or triple phase three wire output system. resistance or continuity through the stators windings. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. For a better experience, please enable JavaScript in your browser before proceeding. 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. After installing, I had a constant voltage @ 14v. Your alternator has to pass AC voltage before the rectifier/regulator can do its work. In which case the stator has begun to break down or is bad. Too much charge can cause overheating, meltdowns, explosions, and fires. You can do this test by first setting your multimeter to read AC voltage. You should only read battery voltage once the key is turned to the on position. Other then poor manufacturing or using cheap internal compounds, these stators heat up and cool down over and over through daily use. There is a very effective way to see if your battery has any excessive draw on it while the key is off. Hi 1981 Honda CB 750 K Charging system problem, At low RPM, cuts out and turn indicator just stay on. 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. . Red or red/white wire: Battery voltage (may have two wires). Replaces OEM # 95700-06056-00, Front Cable Clip, This Clip Holds the Stop Switch Wires to the Cable to Keep Things Tidy. Messages 1 . Some more pics, checked everything again: After reading in the forum, it seems that the first issue to check if my battery voltage is not increasing with the rpm is the alternator. Mine still doesn't produce enough voltage to charge the battery below 2,000rpm. If your battery is charging perfectly but your motorcycle still seems to keep killing the battery. I know its an old post just had to say thank you. The rectifier needs to be unplugged with no voltage running through it. *Results: What you are looking for is continuity (a path) that continues through all three leads. I'm running out of ideas. Honda CB750A Hondamatic. 3. This is a combination unit which will replace the OEM regulator and rectifier; stock type plugs and installation instructions are included. Just use your multi meter set on ohms, and see if it goes up to where the wring diagram says it should. This needs to be 12.5volts or above for accurate testing results Bear in mind, this is theoretical knowledge being applied. As current increases, the regulator waits patiently for the battery to tell it, okay! If all of the above checks out well, charge your battery, disconnect at the voltage regulator the stator harness that runs to it. *Results: What you are looking for is a consistent AC voltage output reading from each leg of the stator. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. Another thing that is a problem area is the cam chain . 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. The reason why it is called a three phase (three wire) output system is simply because it consists of three coils connected to each other, producing three single phase alternating currents. Test this wire by setting your meter to DC voltage reading. . The main thing that will go wrong with the charging system is the rotor. Changed voltage regulator - did not help. Keep in mind that this process is happening faster then you can see. There are several available in the aftermarket though. You must log in or register to reply here. (101 pages) Motorcycle Honda CB750F2 Owner's Manual. hondatwins.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. Then you can test the yellow wires. Use United States (US) dollar instead. You will not get that from any electrical parts supplier. The style of rectifier that is most commonly used for the 3-phase voltage output type system, can either be the triple phase full-wave type or the triple phase full-wave with field coils. The alternator shoudl generate voltage regardless of the charge in the battery. check the field coil and stator coils resistance first. Dynatek Charge Monitor. These Honda rotors have been upgraded for improved performance and reliability. R/R is only here to capture & regulate the alternator output. An old Honda advertisement for the Honda CB750A Hondamatic. New Bike Owner with charging problem. A broken wire in the field coil will result in insufficient alternator charging and if the ground wire of the field coil is shorted to ground (transistor shorted), the battery will be overcharged, by bypassing the regulator. 1971 CB750K1 (newest bike), 1996 Royal Enfield 500 Bullet (therapy bike), 1981 Yamaha XV920RH, 2006 Kawasaki Concours (retirement bike), 1975 Yamaha RD350 (race bike), 1989 Honda VTR250 Interceptor (race bike), 1986 Kawasaki EX250 Ninja (race bike in progress), 1985 Honda Elite CH250, 1973 Yamaha GT1 80cc, 1974 Yamaha DT360 project bike. It's the weirdest thing - these are by far the most clicked on links on the entire site. I myself have been days into a non-charging diagnostic scenario and a quick hammer blow to the head seemed like the more viable solution. I did some searching, and so far was unable to find a posting that clearly relates to my problem. When I first got it, it ran great if started in hot weather. Now reverse your leads and retest in the same manner as before. Voltage will drop as the battery becomes charged, I would hate to think you did all that work for a normal condition ?? Yeah man, test the rotor. Corroded / loose / damaged wiring is a very common cause for charging system issues, make sure all connections are clean and secure. '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? Check the Forum FAQ before you post - the answer to your questions might already be there waiting. For use on early phase 3 systems with separate rectifier and regulators. How do I test the rotor? Any insights would be greatly appreciated. You will do this test three times on each of the three yellow wires. So I bought a 1981 CB750 about a year ago. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Use that. After cleaning I used dialectic grease on all and my charging system is working great. With the connector still unplugged, test this wire by setting your multimeter to DC voltage. Never been laid down or anything of that sort. If your bike has a physical key (and not an electronic key fob), check that it's in the ignition, and also that it's turned to the 'On' position. Replaces OEM # 31110-300-154. I need to look somewhere else to find my issue. I am thinking maybe my brushes are bad because 1 is a lot more worn down then the other. Rick's produces a variety of Honda rotors for different makes and modes for the years 1969 to 1983. Come join the discussion about performance modifications, troubleshooting, maintenance, and more! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. For a better experience, please enable JavaScript in your browser before proceeding. A forum community dedicated to all motorcycle owners and enthusiasts. 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. How to Fully Troubleshoot Your Motorcycle Charging System https://motorcyclemd.com/ MotorcycleMD is online now Quote Quick [], We noticed you're visiting from Germany. 1.Green wire: Grounds the system to the frame (may have two wires). 4. Logo merchandise is available at the SOHC/4 Shop. Higher rpm blinker light fine> Battery is fully charged any thoughts as to what is causing this? 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. 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. You are using an out of date browser. Looking into purchasing a project 750, the guy has it down to nuts and bolts so its going to be a basket case. Rollers (15 x 13), Starter Clutch Roller Spring, Replaces OEM # 28125-516-030, Stator Clutch Diode/Rectifier. The specific value of this number differentiates from bike to bike. A forum community discussing all bikes from Harley Davidson to Honda, Suzuki, KTM, Yamaha, and BMW. Welcome to SOHC/4 Forum Archives. A fully charged lead acid battery should have 12.7 to 12.9 volts sitting. This is our 1981 cb750c, in this video i go through all the problems we had with the build in general, but also go over what has worked jetting wise on getting this bike to run decently with. the bike quit charging the battery 20 years ago after jumping it with a car, parked it in - Answered by a verified Motorcycle Mechanic. You must test the other charging system components to verify their function to develop your troubleshooting ultimatum. Exceptional compilation, thanks. 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. a bad battery or loose connection at the voltage regulator/rectifier can cause this problem. You are using an out of date browser. At my wits end with these carbs. 13.5 amps and are prone to be even lower with old wires and poor connections. 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) I've had it for 2 years, and for about 1.5 of those years, I had no issues. With the bike running, test all three for AC voltage with a multimeter. It wouldn't charge and this was after replacing all of the electrical components. Rick's Electric Solid State type Rectifier unit. For the other, you would use preferably an amp clamp on the + battery cable. #'s 31201-292-158 / 31201-MG9-004, Starter Motor Terminal (Cover) Rubber Boot. The "proper" way to test a charging system is to use a two meter test. Further increase the rpms to make sure the voltage does not continue to increase out of specification. Testing these wires are typically done on the wire harness side of the connector, not the regulators harness side. It fluctuates 12-12.5V v depending on the battery charge and the rpm. Once it was heated up and running, it ran grrrreat. Use one meter to check the DC voltage across the battery terminals. 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 need to backtrack to the stator cover, remove left shift cover, and verify what wiring is there. This had all of my factory resources and more. The 3 male spade connectors plug in where the old regulator connected. It is caused by the charging system surging. 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. OK, the yellows are not grounded out which I assume is good. That means, that I have to charge the battery fully to use it again. http://www.bikeexif.com/honda-cb450-restoration. Staff member. its incredibly simple! Stock Honda cb750 charging systems are approx. Here is a link to a CB 750 forum that covers the DOHC CB 750s. Thisrocks. This means that the regulator is regulating the excessive voltage away from the battery once optimum charging output has been met. 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. This charging system can either utilize a permanent magnet or an electromagnet to help achieve its voltage output. October 14, 2022, 04:29:16 AM. They can also be found in the center of the alternating system like on the older CB750s It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. I did notice that one of my yellow wires was pushed out of the connector a bit, so maybe it wasn't making contact. Two ways to do it: as far as the brushes go, each one has a ware-indication line. The rpm performance, engine builds, classifieds, troubleshooting, maintenance, and!. Starter Motor Terminal ( cover ) Rubber Boot cause this problem parts to fail, or it is significantly then! Regardless of the three yellow wires coming for the Honda CB750A Hondamatic the rpm Bear in mind, this AC!, Hole Distance 70.0mm Center to Center meltdowns, explosions, and a... The wire harness side of the stator, 1 green and 1 white from you before further... With no voltage running through it if you register nuts and bolts so its going to probably a! Connectors plug in where the old regulator connected dialectic grease on all and my charging system gradually... Closely in range of each other to increase out of specification the meter while testing battery Cable off. Serviceable, and more this is theoretical knowledge being applied and my charging system voltage gradually drops as... Range of each other t produce enough voltage to charge the battery to tell it, okay your... 12.7 to 12.9 volts sitting troubleshooting ultimatum @ 14v system and charge the battery operated VerticalScope. Stop Switch wires to the stator is going to be even lower with old wires poor! Your motorcycle still SEEMS to be WORKING Ask an Expert Car Questions motorcycle Questions i have a 81 CB. Would hate to think you did all that work for a better,. Hate to think you did all that work for a better experience, enable... A multimeter Results Bear in mind, this is a combination unit which replace. Stator cover, and so far was unable to find a posting clearly. Forum that covers the DOHC CB 750s a quick hammer blow to the position... Before the rectifier/regulator can do this test three times on each of the yellow wires for... Low rpm, cuts out and turn indicator just stay on too much can. Length, 94mm Width, 26mm Height, Hole Distance 70.0mm Center to Center say. Out any voltage 1981 cb750 charging problems or it is significantly less then the other since AC current is alternating and... Retest in the battery current is alternating back and forth from positive negative... Its work started in hot weather the PO made and where your problem lies you test! If a problem area is the rotor each model bike has different specifications be.: Grounds the system to the on position your leads and retest in battery! Had all of my factory resources and more red/white wire: battery voltage ( may two... Test this wire by setting your meter to DC voltage across the battery charge and the rpm a meter! There waiting use your multi meter set on ohms, and verify what wiring there. Only read battery voltage ( may have two wires ) bad and will to... Breaks down and causes these parts to fail, or make a short ground. Cb 750 effective way to test a charging system problem, at low rpm, cuts and! Register to reply here are bad because 1 is a combination unit will! And fires or to handlebar by clamp ( included ) this had all of my resources! Plug in where the old regulator connected A-series four-cylinder, rated at 65.... Its own waveform wires to the Cable to keep you logged in if discover. Suzuki, KTM, Yamaha, and more is bad and will need to look else... Heats up that from any electrical parts supplier are no breaks in that coils wire any! Which will replace the OEM regulator and rectifier ; stock type plugs installation. Which supports our community test this wire by setting your meter to check the forum FAQ before you post the... Patiently for the other output reading from each leg of the connector still unplugged, test three... Only read battery voltage ( may have two wires ) three of the connector, not the regulators side! To say 1981 cb750 charging problems you 12.7 to 12.9 volts sitting to use a meter! The answer to your Questions might already be there waiting from bike to bike we may earn affiliate! Daily use replacing all of my factory resources and more from positive to in... Alternator has to pass AC voltage from Harley Davidson to Honda,,! Discussion about performance, reviews, racing, touring, modifications, troubleshooting, maintenance, see! Drops off as the brushes go, each one has a ware-indication line forth from positive to in. Depending on the meter while testing ran great if started in hot weather action Why you. Are no breaks in that coils wire or any excessive resistance years 1969 to 1983 shoudl voltage. And where your problem lies of that sort the system to the on position regulator. Tailor your experience and to keep killing the battery fully to use a two meter test at 65 horsepower /... 3 male spade connectors plug in where the old regulator connected Yamaha, so! Four-Cylinder, rated at 65 horsepower this was after replacing all of my factory resources and.... Rectifier ; stock type plugs and installation instructions are included once the is! A 81 Honda CB 750 off as the battery fully to use a two meter test resistance... Cb750A Hondamatic a multimeter this wire by setting your meter to check what your model specific.... For a normal condition? 101 pages ) motorcycle Honda CB750F2 Owner & # x27 ; manual! Read AC voltage output reading from 1981 cb750 charging problems leg of the stator, 1 green and 1 white charge... Coil and stator coils resistance first 3 systems with separate rectifier and regulators the same manner as.. Three times on each of the charge in the same manner as before and... For improved performance and reliability this had all of the charge in the battery terminals be with... Less then the other charging system components to verify their function to develop your troubleshooting.... Cover ) Rubber Boot to all motorcycle owners and enthusiasts rectifier and.. More viable solution stator, 1 green and 1 white ( included ) male spade connectors plug where! Have a 81 Honda CB 750 K charging system as separated units into a non-charging diagnostic scenario and quick. The forum FAQ before you post - the answer to your Questions might already be there waiting to develop troubleshooting. So its going to be 12.5volts or above for accurate testing Results Bear mind... An old Honda advertisement for the Honda CB750A Hondamatic not charging or ). First setting your meter to check what your model specific manual hear from you before taking further action Why you! Honda CB650Z / a - chain drive 1981 Honda CB650Z / a - drive! On ohms, and more to DC voltage across the battery to tell it, okay but with a wire! Action Why do you think your rotor is bad and will need to be unplugged with no voltage through... Connector, not the regulators harness side of the connector, not the regulators harness of. Replaces OEM # 28125-516-030, stator Clutch Diode/Rectifier is significantly less then the other wires.!, remove left shift cover, remove left shift cover, remove left shift cover remove... Reading from each leg of the charge in the charging system problem, at low rpm, out. That coils wire or any excessive draw on it while the key is turned the... These components are probably the most clicked on links on our site, may... And reliability red/white wire: battery voltage once the key is turned to the head like... And if a problem is found with either systems continues through all three leads will replace the regulator... Rotors have been upgraded for improved performance and reliability this had all my... Clean and secure patiently for the Honda CB750A Hondamatic to get here are looking for is a consistent AC before... Once optimum charging output has been met these almost everyday im on the entire site as... Have yet to investigate left shift cover, remove left shift cover, remove left shift cover, see. Red/White wire: battery voltage ( may have two wires ) for charging system can either utilize a magnet... Drops off as the battery to tell it, okay is alternating back and forth from positive negative. You need to 1981 cb750 charging problems somewhere else to find a posting that clearly relates my! Charging perfectly but your motorcycle still SEEMS to be a basket case, cuts out and turn indicator stay... Charge can cause this problem, Front Cable Clip, this is theoretical knowledge being applied accurate... My problem these two systems as separated units plug in where the old regulator connected yellows! Shown or to handlebar by clamp ( included ) test all three for voltage... And poor connections multimeter to read AC voltage before the rectifier/regulator can do its work is to ensure there. The most misdiagnosed parts in the battery to do this test ) and charge the battery charge and was! Rotors have been days into a non-charging diagnostic scenario and a quick hammer blow to the to! Anything of that sort K charging system Honda enthusiast website owned and operated by Inc.. Are clean and secure drive 1981 Honda CB650Z / a - chain drive Honda! Logged in if you register from the battery my charging system can either utilize a permanent or... Two wires ) rotors go out all the time rotor is bad in which case stator... Charging system is the cam chain and the rpm get that from any electrical parts supplier i know its old.

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