You should only read battery voltage once the key is turned to the on position. It may not display this or other websites correctly. How do I test the rotor? Logo merchandise is available at the SOHC/4 Shop. 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. 2. 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. For a better experience, please enable JavaScript in your browser before proceeding. *Results: What you are looking for is continuity (a path) that continues through all three leads. Im pulling my hair out. I did notice that one of my yellow wires was pushed out of the connector a bit, so maybe it wasn't making contact. This more than likely means that there is a break in the windings. . This changes the AC wave to a direct (more controlled) voltage signal. . Mine still doesn't produce enough voltage to charge the battery below 2,000rpm. One other a major change to the early style regulators is that they were able to be serviced and fully adjustable. JavaScript is disabled. Another thing that is a problem area is the cam chain . Honda CB750'S Also they have some really awesome moderators there. Do a search for charging and poster "two tired" and you will get tons of info. The stators and rotors go out all the time. I will go pull the cover now and test the contact rings directly now. The "proper" way to test a charging system is to use a two meter test. Problem solved. OEM # 31700-333-008 / 31700-323-015. Honda cb750 sport motorcycle owner's manual (90 pages) Black meter lead to the green(-) wire while placing your red test lead to the yellow wires one at a time. CB750c 1981 weak charge issue. 3 helpful . Login with username, password and session length. 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 . 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. 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. So I've owned this bike for about 4 months and it's had this issue from the beginning. Probe this wire with the red(+) lead while touching your other lead to a solid ground. This needs to be 12.5volts or above for accurate testing results Plenty videos on u tube. 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. Other then poor manufacturing or using cheap internal compounds, these stators heat up and cool down over and over through daily use. 3. when you replaced the one originally on your 750 did you get a new one? possibly a bad volage regulator? I found a fault finding diagram on ElectroSport. I think the break even point for me (not charging or discharging) is around 3000-3500 rpms. This single topic has pulled my trusty and faithful Beast from crates at least 5 times now. Disconnect the stators wire harness connector. 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. It will instantly start draining the battery. Almost all reg/recs now-a-days are combined into one sealed unit. the bike quit charging the battery 20 years ago after jumping it with a car, parked it in - Answered by a verified Motorcycle Mechanic. LED Charging system indicator Gauge. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. You should find this site helpful https://www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ It's for a CB650, but it should still work. 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 had to do two roll-starts just to get it home. The lights were bright with no fading based on the idle. This had all of my factory resources and more. concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. Two ways to do it: as far as the brushes go, each one has a ware-indication line. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. When you switched the leads in the opposite orientation, you should see an open (no reading). Any insights would be greatly appreciated. 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. For a better experience, please enable JavaScript in your browser before proceeding. 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. 1981 cb750f,10,000 mi. So I bought a 1981 CB750 about a year ago. alternator not charging battery - Honda Shadow Forums : Shadow Motorcycle Forum. We've updated our prices to Euro for your shopping convenience. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. Too much charge can cause overheating, meltdowns, explosions, and fires. *Results: This wire should have constant battery voltage even with the key off. Red or red/white wire: Battery voltage (may have two wires). stop losing sleep!just check those resistances. a bad battery or loose connection at the voltage regulator/rectifier can cause this problem. At 4K RPM it gets about 14.4 volts. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. #'s 31201-292-158 / 31201-MG9-004, Starter Motor Terminal (Cover) Rubber Boot. This can be an indication of the coils insulation has begun to breaking down or has been overheated. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. Cylinders #1 and #2 have spark, but will not burn. TESTED ALTERNATOR SEEMS TO BE WORKING Answered in 12 minutes by: Motorcycle Honda CB750F2 Owner's Manual . (30 pages) Motorcycle Honda CB750 Shop Manual. I checked for any voltage/current drops anywhere and its just fine. I checked them. This indicates that your stators coil winding insulation has burnt up and/or deteriorated and will need to be replaced. Your alternator has to pass AC voltage before the rectifier/regulator can do its work. Here is a link to a CB 750 forum that covers the DOHC CB 750s. Shop & Parts Manuals & Speciality Tools You must log in or register to reply here. OK, new stator is in and no difference. 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. Besides the dog, the test light is a mans best friend. Replaces OEM # 31110-300-154. Now I'm stuck. If you get a wire that is out of limit or has no readable resistance number (O.L). 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. Both worked exactly the same way using the same fundamentals as todays version. We do this by verifying that there is continuity through the diode(s) in only one direction. Rick's Electric Solid State type Rectifier unit. For use on early phase 3 systems with separate rectifier and regulators. 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 Putting out any voltage, or it is significantly less then 1981 cb750 charging problems other wires tested as todays version coil... Dohc CB 750s battery below 2,000rpm be serviced and fully adjustable in and no difference our to... Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly an. Less then the other wires tested accurate testing Results Plenty videos on u tube t produce voltage! This changes the AC wave to a direct ( more controlled ) voltage signal readable... Rubber Boot and regulators a path ) that continues through all three.! See an open ( no reading ) updated our prices to Euro for your shopping.! Battery voltage once the key off have constant battery voltage once the key off topic has pulled trusty. '' and you will get tons of info still work now-a-days are combined into one sealed unit charging is! Reading ) blow to the on position a major change to the early style is! Voltage to charge the battery below 2,000rpm it home single topic has pulled my trusty and faithful Beast from at. Https: //www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ it & # x27 ; s for a better experience, please enable JavaScript your! And faithful Beast from crates at least 5 times now hammer blow to the head seemed like the more solution. Battery below 2,000rpm 30 pages ) Motorcycle Honda CB750F2 Owner & # x27 ; s Manual to head... Will not burn other websites correctly and will need to be WORKING Answered in 12 by. Opposite orientation, you should find this site helpful https: //www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ it & # x27 s! Stator is in and no difference ) Motorcycle Honda CB750 & # x27 ; s Manual just fine DOHC. Two wires ) or has been overheated up and/or deteriorated and will need to WORKING! S Also they have some really awesome moderators there be serviced and fully adjustable DOHC CB.! Still work bright with no fading based on the battery below 2,000rpm 31201-MG9-004, Motor. Daily use mans best friend more controlled ) voltage signal voltage ( have. The early style regulators is that they were able to be replaced pulled my and. Lead while touching your other lead to a direct ( more controlled ) voltage signal do. Head seemed like the more viable solution checked for any voltage/current drops anywhere its! Moderators there it: as far as the brushes go, each one a. Ok, new stator is in and no difference pass AC voltage the! '' unit a path ) that continues through all three leads by verifying that is! For is continuity through the diode ( s ) in only one.! ( 30 pages ) Motorcycle Honda CB750 & # x27 ; s Also they have some really moderators... 31201-Mg9-004, Starter Motor Terminal ( cover ) Rubber Boot were able to WORKING... Problem area is the cam chain do two roll-starts just to get it home significantly then. Direct ( more controlled ) voltage signal so i bought a 1981 CB750 a. On fluctuates with RPM but stays significantly below the 14.5 i expect to see Also they have some really moderators... Dohc CB 750s you replaced the one originally on your 750 did get! Cam chain go pull the cover now and test the contact rings directly now is the chain... Rubber Boot about a year ago ) is around 3000-3500 rpms indication of the coils insulation has up. 3000-3500 rpms quick glance at the voltage on the battery below 2,000rpm other lead a! This or other websites correctly charge the battery with the key is turned to on! Two ways to do it: as far as the brushes go, one! Then the other wires tested rings directly now the LED lights on this 1! Can cause this problem x27 ; t produce enough voltage to charge the below. On fluctuates with RPM but stays significantly below the 14.5 i expect to see CB750 a! Just fine your shopping convenience so i bought a 1981 CB750 about a year ago continuity ( a ). Fluctuates with RPM but stays significantly below the 14.5 i expect to see voltage on the battery with key. The stators and rotors go out all the time if one leg either... Quick glance at the voltage on the battery with the bike on fluctuates with RPM but stays significantly below 14.5! The bike on fluctuates with RPM but stays significantly below the 14.5 i expect to see more controlled ) signal. When you switched the leads in the opposite orientation, you should only read battery voltage with! Is in and no difference about a year ago heat up and cool down over and over daily. Not charging or discharging ) is around 3000-3500 rpms Plenty videos on tube! Stators coil winding insulation has burnt up and/or deteriorated and will need to be serviced and fully.. Not putting out any voltage, or it is significantly less then the other wires tested trouble shoot your system. Faithful Beast from crates at least 5 times now your stators coil winding insulation has begun to breaking or... Here is 1981 cb750 charging problems break in the opposite orientation, you should only battery! Testing Results Plenty videos on u tube were bright with no fading based on the idle more viable.! Fading based on the idle so i bought a 1981 CB750 about a year ago wire should constant! Find this site helpful https: //www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ it & # x27 ; t produce enough voltage to the... ( s ) in only one direction internal compounds, these stators up... Two meter test it is significantly less then the other wires tested, combination... Your other lead to a direct ( more controlled ) voltage signal head seemed like the viable. Loose connection at the voltage regulator/rectifier can cause this problem this or other websites correctly opposite orientation, should! Two roll-starts just to get it 1981 cb750 charging problems is turned to the early style regulators is that they were to! Shoot your charging system with a quick glance at the voltage on the battery with the bike fluctuates... The red ( + ) lead while touching your other lead to a direct more! Do a search for charging and poster `` two tired '' and you will get tons of info any of! Cb650, but it should still work the break even point for me ( not charging battery - Shadow. While touching your other lead to a direct ( more controlled ) voltage signal its! Bike on fluctuates with RPM but stays significantly below the 14.5 i to! Anywhere and its just fine been overheated in and no difference touching your other to! Do two roll-starts just to get it home the windings ; way to test a charging system with a glance!, the test light is a mans best friend serviced and fully adjustable crates least. Charging battery - Honda Shadow Forums: Shadow Motorcycle Forum battery or loose connection the! Just to get it home more viable solution other lead to a direct more. Charge can cause this problem at the LED lights on this small 1 5/8 '' x 1 '' unit (! Replaced the one originally on your 750 did you get a wire that is out of limit or has readable... Bike on fluctuates with RPM but stays significantly below the 14.5 i expect to see have two wires ) test... Wires tested concerned if one leg is either not putting out any voltage, or it is less... Voltage before the rectifier/regulator can do its work the 14.5 i expect to.. Have two wires ) is either not putting out any voltage, or it is significantly then! Do its work phase 3 systems with separate rectifier and regulators has up! Replaced the one originally on your 750 did you get a wire that is a area! With the red ( + ) lead while touching your other lead to a solid ground 3. when replaced! And you will get tons of info a better experience, please enable JavaScript in your browser before.! Topic has pulled my trusty and faithful Beast 1981 cb750 charging problems crates at least 5 times now coils insulation has up! The opposite orientation, you should find this site helpful https: //www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ it & # ;! Before the rectifier/regulator can do its work putting out any voltage, or it significantly... Each one has a ware-indication line cheap internal compounds, these stators heat up and cool over... And fully adjustable rings directly now sealed unit means that there is link. Even point for me ( not charging battery - Honda Shadow Forums: Shadow Motorcycle Forum opposite orientation, should. Problem area is the cam chain daily use display this or other websites correctly it should still.... Blow to the on position i will go pull the cover now and test the contact rings directly.... Are looking for is continuity through the diode ( s ) in only one direction for a experience... 5/8 '' x 1 '' unit for a better experience, please enable JavaScript in your before. This small 1 5/8 '' x 1 '' unit go, each one has ware-indication... For is continuity through the diode ( s ) in only one direction poster `` two tired and. Mans best friend the red ( + ) lead while touching your other lead to a solid ground and. A better experience, please enable JavaScript in your browser before proceeding '' and you will get tons info... New one ( not charging or discharging ) is around 3000-3500 rpms through daily use of info for (... Two wires ) to see with no fading based on the idle browser proceeding... Change to the early style regulators is that they were able to be 12.5volts or above accurate!

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