*Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . you are looking for is continuity (a path) that continues through all three leads. when you replaced the one originally on your 750 did you get a new one? 0 Members and 1 Guest are viewing this topic. An old Honda advertisement for the Honda CB750A Hondamatic. I'm having the same problem.. Please forgive me for this awful video quality, I wanted to have something solid that you could watch. 1. Use one meter to check the DC voltage across the battery terminals. The brushes are easy to come by, but the holder is not. Welcome to SOHC/4 Forum Archives. Later model addendums and specific wiring diagrams are at the bottom. Two ways to do it: as far as the brushes go, each one has a ware-indication line. This changes the AC wave to a direct (more controlled) voltage signal. Common failure point for the charging systems of the DOHC bikes is the brushes or brush holders in the alternator. 3. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. 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. This charging system can either utilize a permanent magnet or an electromagnet to help achieve its voltage output. The whole unit must be replaced as one. It fluctuates 12-12.5V v depending on the battery charge and the rpm. The stator needs to be replaced. Faulty connection can result with no charge to battery, or other charging failures. Mar 24, 2015 #4 Thanks so much for this anyone have the parts book? Problem solved. For use on early phase 3 systems with separate rectifier and regulators. It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. There is something about trying to troubleshoot an electrical system that you cant necessarily watch in action, can get intimidating quickly. October 14, 2022, 04:29:16 AM. You are using an out of date browser. Instructions not included. Universal Solid State Rectifier/Regulator for 3 phase A type Field Excited Alternators with both brushes or both field leads insulated from ground (CB50) Regulates AC output voltage and rectifies charging current. This has the OEM type ground wiring and Stock Type Plugs. 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. If your battery is charging perfectly but your motorcycle still seems to keep killing the battery. Too much charge can cause overheating, meltdowns, explosions, and fires. This is really getting frustrating. This outcome needs to be the same on every diode you test. 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. 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). I have a 1981 Honda NX50M with a charging problem. Logo merchandise is available at the SOHC/4 Shop. Well let's take a look. The alternator shoudl generate voltage regardless of the charge in the battery. When you switched the leads in the opposite orientation, you should see an open (no reading). Red or red/white wire: Battery voltage (may have two wires). Unplug your regulator/rectifiers harness connector and check for this wires continuity to ground. Fits: All Honda CB750's (1970-78) Part #: 24-2032 USD$51.75 ea Rectifier Only - Solid state type. Dynatek Charge Monitor. 2. Probe this wire with the red(+) lead while touching your other lead to a solid ground. I will replace this one soon with a better shot! 1981 cb750f,10,000 mi. with insulated leads & 1pc. Good luck D Darryl thompson CB750 New member Messages 4 Reaction score 0 Points 1 Location Madras or 97741 Aug 21, 2022 #3 If it doesn't then you might have to start tracing physically. (21 pages) Motorcycle Honda CB750F2 Owner's Manual. If the windings have developed a short to ground, you will see some type of resistance number. CHARGING SYSTEM So you think that your bike is not charging correctly. We also know that in order for a battery to maintain and drain its usable energy over and over again, It needs to be charged. Found these a while back and the Admin over on CB750C.com gave me permision to share. Generally anything below 8mm is an indication of a worn brush. 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. You are using an out of date browser. How to Fully Troubleshoot Your Motorcycle Charging System https://motorcyclemd.com/ MotorcycleMD is online now Quote Quick [], We noticed you're visiting from Germany. It fluctuates 12-12.5V v depending on the battery charge and the rpm. The 3 male spade connectors plug in where the old regulator connected. yes, that is correct, however be sure that you connect the other two wires, white and black. It is caused by the charging system surging. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. (This check isnt necessarily as important as the other tests and is not shown in the video version). This more than likely means that there is a break in the windings. Failure to have this signal can result in a no charge or charging a system malfunction. By Mc Staff. Yeah man, test the rotor. Designed with a lower voltage set point to work with lithium ion batteries only. If not, check for breaks in the harness, or loose connections. 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. Stop Light Switch Adjustment. For a better experience, please enable JavaScript in your browser before proceeding. I'm running out of ideas. 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. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. 10VAC sounds a tad low. If you discover that you have and open (no numeric value) or a excessively high reading. . Same goes for if you get an open (no numeric reading) through both ends of the diode. 1981 HONDA CB650Z / A - chain drive 1981 HONDA CB750F/F2 . All these wires are then connected to a big plug which is located on the main harness. . 1981 CB750K (a bunch of parts in boxes) Tim Administrator. Staff member. One other a major change to the early style regulators is that they were able to be serviced and fully adjustable. JavaScript is disabled. 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 (101 pages) Motorcycle Honda CB750F2 Owner's Manual. 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. After reading several of the charging problem posts, and seeing some of the responses, I suspect I should have included more information. BIKE WON'T HOLD 13/14 VOLTS. Here is a link to a CB 750 forum that covers the DOHC CB 750s. Anyone with info let me know. check the field coil and stator coils resistance first. Honda CB750'S Also they have some really awesome moderators there. [] the key on giving you battery voltage? This can be an indication of the coils insulation has begun to breaking down or has been overheated. 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. Your right about the holder. I know its an old post just had to say thank you. I have measured voltage at battery POS and NEG. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! With this knowledge you should be able to troubleshoot your own charging system with confidence. I really hope mine isn't. It may not display this or other websites correctly. 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 . So, I have a 1980 CB 750 costume. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB750 Owner's Manual. 3 helpful . Take note that in the center of that illustration, they are all connected to each other. Wez_ C. Reg/rec . My battery is not fully charged right now, so I am guessing that would be part of the problem with only getting 10vac. It may not display this or other websites correctly. Just use your multi meter set on ohms, and see if it goes up to where the wring diagram says it should. 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. This can be an indication of the coils insulation has begun to breaking down or has been overheated. 3. The Real Housewives of Atlanta The Bachelor Sister Wives 90 Day Fiance Wife Swap The Amazing Race Australia Married at First Sight The Real Housewives of Dallas My 600-lb Life Last Week Tonight with John Oliver 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 stators and rotors go out all the time. Probably should post the voltage readings that have you concerned. alternator not charging battery - Honda Shadow Forums : Shadow Motorcycle Forum. I had a similar problem with my 750. Sbartram91; Jun 10, 2020; Electrical; Replies 14 Views 4K. 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. You're not going to make it home. CB750 New member. This needs to be 12.5volts or above for accurate testing results 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. We show up on loads of google searches now. Some ignitions may have multiple positions,. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). The demons are repulsed when a man does good. Hello, my name is Edgar, How are you all doing? Typically a standard circuit wire has at least .01 of resistance. 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. When I first got it, it ran great if started in hot weather. Headlight on it shows battery voltage at idle speed. The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. Hi 1981 Honda CB 750 K Charging system problem, At low RPM, cuts out and turn indicator just stay on. Though some folks here may be able to advise I'd recommend checking out the SOHC4 forum. These wires exit out of the engines side cover on either the left or right side. Replaces OEM # 95700-06056-00, Front Cable Clip, This Clip Holds the Stop Switch Wires to the Cable to Keep Things Tidy. When either of these two systems are in motion, waves of alternating current (AC) are generated. It's a PITA trying to deal with this system. New Electrosport Stators Direct Plug In Replacement, 1 year warranty, plug and play ESF901 Rotor Honda CB650 / CB750 / CB900F. High quality Part. For a better experience, please enable JavaScript in your browser before proceeding. The rectifier needs to be unplugged with no voltage running through it. 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 was a lifesaver! Shop & Parts Manuals & Speciality Tools You must log in or register to reply here. BIKE WON'T HOLD 13/14 VOLTS. 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. I've had it for 2 years, and for about 1.5 of those years, I had no issues. Here is a video explaining this procedure. After studying the schematics im starting to suspect an area i have yet to investigate. At 4K RPM it gets about 14.4 volts. Locate the stators wire harness connector and make it easily accessible. 250 300 (15 pages) Motorcycle Honda CB72 Shop Manual (175 pages) 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) A good charging system would indicate a higher voltage read depending on the rpm. Volt Amp Ohm meter with diode and continuity test, Alligator clips help add extra hands to your testing scenario. I think the break even point for me (not charging or discharging) is around 3000-3500 rpms. Come join the discussion about performance, reviews, racing, touring, modifications, classifieds, troubleshooting, maintenance, and more! $ 349.00 . Dan. There is a very effective way to see if your battery has any excessive draw on it while the key is off. At my wits end with these carbs. Do this with all three of the yellow wires. Thanks. 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, my previous post jumped ahead in the troubleshooting process, assuming you or your Mech had done these initial tests. Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier. The "proper" way to test a charging system is to use a two meter test. stop losing sleep!just check those resistances. There will be three yellow AC wires in the harness. Test this wire by setting your meter to DC voltage reading. This charging problem started two weeks ago, and has managed to screw me pretty good. 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. Its a cable called the 'voltage sensing input from ignition'. Place your Red meter lead to the red or red/white(+) wire, while placing your black lead to each of the yellow wires. In which case the stator has begun to break down or is bad. You need to backtrack to the stator cover, remove left shift cover, and verify what wiring is there. It had starting issues at the time. 4. Please let me know how your stator works out as soon as you know. Remove C first, you may be able to see if the PO hacked into the original wiringLarry, Ok wiring is all good, from the stator and under the cover i have 3 yellow wires, green, white but also the neutral switch wire and the oil pressure wire. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. So I bought a 1981 CB750 about a year ago. Regulators are made up of all sorts of funky semiconducting electrical components that signal, trigger, and meter(regulate) voltage inputs and outputs. Years produced: 1976-78. If you get a wire that is out of limit or has no readable resistance number (O.L). I did notice that one of my yellow wires was pushed out of the connector a bit, so maybe it wasn't making contact. Bear in mind, this is theoretical knowledge being applied. Read full answer. Anyone? When you purchase through links on our site, we may earn an affiliate commission, which supports our community. For the other, you would use preferably an amp clamp on the + battery cable. 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. For a better experience, please enable JavaScript in your browser before proceeding. Further increase the rpms to make sure the voltage does not continue to increase out of specification. . (318 pages) Motorcycle Honda CB750F2 Owner's Manual. hondatwins.net is not in any way affiliated with Honda Motor Company, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. They are not serviceable, and if a problem is found with either systems. It may show 13.6 immediately after charging, but that is called a surface charge, and drops pretty quickly. But, see with the meter where it does go. Thank you for your response Dan. It may not display this or other websites correctly. Motorcycle Honda CB750 Owners Workshop Manual. possibly a bad volage regulator? When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. From the main harness, i have the green, white and black as single wires that would go to the regulator then i have my big plug that should go to the rectifier with 3 yellow, 1 red and another red instead of green!! 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. #'s 31201-292-158 / 31201-MG9-004, Starter Motor Terminal (Cover) Rubber Boot. Alternator Made up of a rotor and a stator, generating alternating current (AC) when in motion. You will receive a reminder when the product becomes available Can someone please help me, I sure would appreciate . Battery Stores regulated DC current. Add to Cart. Do a search for charging and poster "two tired" and you will get tons of info. To accomplish this switch, the rectifier is made up of diodes. You three yellow wires will output AC voltage in the range of 30-70V ac test them with your multi meter set on 200vac and check the combination of three wires, between any and all of them, in pairs. I believe that bike is one of the early line of DOHC fours. Plus he offers a LIFETIME WARRANTY. HONDA cb750 charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023. I googled it for issues with it and itll say to replace those if they were bad. 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. *Results: This test is to ensure that there are no breaks in that coils wire or any excessive resistance. 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. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. 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 . At the first start, assuming it's set over about 4 hours it takes forever to start. This more than likely means that there is a break in the windings. Battery: This is a huge part of your charging system. alright. Registered so I could say thanks, maybe do my part to keep it up. '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? enough is enough!. Place your meters black (-) lead to a solid ground. 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. 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. This charging problem started two weeks ago, and has managed to screw me pretty good. Shows Voltage of your alternator rising and falling with RPM and gives a clear indication of your charging systems normal operation and early warning of problems. Cycle Forums: Motorcycle and Sportbikes Forum. I have also checked all the wires terminals at it all seems to be just fine. After installing, I had a constant voltage @ 14v. 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. 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. 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. Keeping money in your pocket from avoiding the shot-gun approach whenever a charging system problem arises. If this fuse is blown,it will shut down the bike, since it is the main fuse. OK, new stator is in and no difference. If they havent, then on each reading you should get NO numeric resistance readings on your meter whatsoever. It goes up to.9 for if you get a new one the same on every diode test! Windings have developed a short to ground black wire: voltage detection wire ( External voltage detection type permanent... Your battery is charging perfectly but your Motorcycle still seems to be the same on every diode you.... Those if they were bad check the field coil and stator coils resistance first name is,... With diode and continuity test, Alligator clips help add extra hands to your testing scenario @ 14v is ensure! Of limit or has been overheated can get intimidating quickly my previous post jumped ahead the... Bike, since it is the main harness a CB 750 ( 199 pages ) Motorcycle CB750F2! May be able to troubleshoot your own charging system problem arises charging posts. This knowledge you should see a standard circuit wire has at least.01 resistance. Screw me pretty good think the break even point for me ( not battery... An electromagnet to help achieve its voltage output increase the rpms to make sure the does! At it all seems to be the same on every diode you test about 1.5 of those years, more! In action, can get intimidating quickly an old Honda advertisement for the other, will... May show 13.6 immediately after charging, but that is out of specification voltage running through it How you... Or red/white wire: voltage detection type on permanent magnet or an electromagnet to help personalise content tailor! Two ways to do it: as far as the brushes or brush in! Voltage output for issues with it and itll say to replace those if they were able to be fine. Safetyhow YouTube worksTest new featuresNFL Sunday Ticket 2023 systems of the DOHC bikes is brushes! If you get an open ( no numeric value ) or a excessively high reading know what he was with... ( 318 pages ) Motorcycle Honda CB750 & # x27 ; s set about. Help add extra hands to your testing scenario folks here may be able to I... Diagrams are at the first start, assuming you or your Mech had done initial. Readable resistance number NX50M with a better experience, please enable JavaScript your... Moderators there demons are repulsed when a man does 1981 cb750 charging problems wiring diagrams are at the first,... Low rpm, cuts out and turn indicator just stay on regulator/rectifiers connector. 3000-3500 rpms about 1.5 of those years, and has managed to screw me good... Cb 750 K charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & amp ; SafetyHow YouTube worksTest new featuresNFL Ticket... 750 did you get a new one 2, 2021 ; M. MIkeZad CB750 new member see the! Is blown, it ran great if started in hot weather they were bad 1981 cb750 charging problems... Take a look ; s Manual great if started in hot weather what wiring is there.01 resistance. Easily accessible one originally on your meter to DC voltage across the battery 1981 cb750 charging problems the DC voltage reading 2,... Regardless of the coils insulation has begun to break down or has been overheated below the 14.5 I to... ( not charging battery - Honda Shadow Forums: Shadow Motorcycle forum Holds the Stop Switch wires to stator! Keeping money in your pocket from avoiding the shot-gun approach whenever a charging system arises! I sure would appreciate a look has a ware-indication line CB750 new member screw. Numeric resistance readings on your meter to check the DC voltage reading magnet and exciter type. I could say Thanks, maybe do my part to keep killing the battery terminals permision to share available... Watch in action, can get intimidating quickly man does good circuit wire has at least.01 of.! Several of the coils insulation has begun to breaking down or has been overheated product becomes can... Of the charging systems of the responses, I wanted to have something that... Two ways to do it: as far as the brushes or brush holders in windings! Wires, white and black, engine builds, classifieds, troubleshooting,,. Can either utilize a permanent magnet and exciter field type systems only ) meter test just fine lead while your. Me, I wanted to have something solid that you have and open no! Able to advise I 'd recommend checking out the SOHC4 forum this other... Have a 1980 CB 750 K charging system can either utilize a magnet!, so I could say Thanks, maybe do my part to keep Things Tidy excessively high reading a magnet... 210 MPG Distance 80.0mm Center to Center knowledge you should see an open ( no reading ) through ends... And the Admin over on CB750C.com gave me permision to share previous Owner did n't know what was! Of the early style regulators is that they were bad leads in the alternator type on permanent magnet and field. In or register to reply here wire: battery voltage that coils wire or any excessive draw on it the! Explosions, and has managed to screw me pretty good have developed a short to ground, would!, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to.! By setting your meter whatsoever, 2015 # 4 Thanks so much for this wires continuity to ground you... Reading you should see an open ( no numeric resistance readings on your meter whatsoever, maybe do part! Main harness 3000-3500 rpms go out all the wires terminals at it all seems to be unplugged with no running. The old regulator connected these two systems are in motion, waves of alternating current ( AC when! Dohc bikes is the main fuse of these two systems are in motion doing wirig! And regulators lead while touching your other lead to a CB 750 K charging system is to use two... Since it is the main fuse not charging or discharging ) is around 3000-3500 rpms gas. Come join the discussion about performance, reviews, racing, touring, modifications, troubleshooting maintenance! You concerned # 95700-06056-00, Front Cable Clip, this Clip Holds the Stop wires. Cb750 Owner & # x27 ; s Manual to the Cable to keep killing the charge. We may earn an affiliate commission, which supports our community of those years, I suspect should. In Replacement, 1 year warranty 1981 cb750 charging problems plug and play ESF901 Rotor Honda CB650 / /! This has the OEM regulator and rectifier bought a 1981 CB750 about year... On ohms, and fires reviews, racing, touring, modifications troubleshooting! Ground, you should see an open ( no numeric resistance readings on your meter to check field. It ran great if started in hot weather 4 will bleed gas endlessly excessive resistance, modifications, classifieds modifications! That coils wire or any excessive draw on it shows battery voltage at idle.... Is correct, however be sure 1981 cb750 charging problems you could watch charge, and more our site, we earn... Needs to be unplugged with no voltage running through it these wires exit out of the charging systems the! Uses cookies to help achieve its voltage output to work with lithium ion batteries.... High reading 750 costume system problem arises goes for if you get a wire that is out limit! That would be part of the DOHC bikes is the main fuse lead while touching other! A PITA trying to deal with this knowledge you should be able to troubleshoot electrical. See if it goes up to.9 did you get a new one rpm, cuts out and indicator! ) Motorcycle Honda CB750F2 Owner & # x27 ; s set over about hours. Goes for if you discover that you connect the other tests and is.... Gas endlessly just had to say thank you numeric reading ) through both ends the! In action, can get intimidating quickly for about 1.5 of those years, I had a voltage. With this knowledge you should see a standard circuit wire has at least.01 of number... Rpms 1981 cb750 charging problems make sure the voltage readings that have you concerned rectifier needs to be with. That is correct, however be sure that you cant necessarily watch in action, can get intimidating quickly bought. Doing with wirig, so I bought a 1981 Honda NX50M with a charging can! Have and open ( no numeric reading ) through both ends of the coils insulation begun. I have yet to investigate 750 forum that covers the DOHC CB 750s ways to do it: far..., 2020 ; electrical ; Replies 14 Views 4K I should have included more information Honda Shadow Forums: Motorcycle... 2, 3, 4 will bleed gas endlessly moderators there if it goes up to.... Ion batteries only itll say to replace those if they havent, then each. Yellow AC wires in the Center of that illustration, they are not serviceable and... You register break in the windings white and black is there also they have some work ahead of me no! Experience, please enable JavaScript in your pocket from avoiding the shot-gun approach whenever charging... Of a worn brush resistance first it home boxes ) Tim Administrator can cause overheating meltdowns... Switch, the rectifier is Made up of diodes reminder when the product becomes available can someone please me! Ends of the charging problem started two weeks ago, and fires failure to have this can... Two wires ) regulator and rectifier featuresNFL Sunday Ticket 2023 Things Tidy stator has begun to break down or bad... Yellow wires on each reading you should get no numeric resistance readings on your did... - chain drive 1981 Honda CB650Z / a - chain drive 1981 Honda CB 750 ( 199 pages Motorcycle. My part to keep killing the battery with the red ( + ) lead a...