There are several available in the aftermarket though. The "proper" way to test a charging system is to use a two meter test. Battery Stores regulated DC current. 1981 HONDA CB650Z / A - chain drive 1981 HONDA CB750F/F2 . The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. The lights were bright with no fading based on the idle. . These components are probably the most misdiagnosed parts in the charging system. Rick's Electric Brand Lithium Ion Battery Compatible Rectifier-Regulator. I use these almost everyday Im on the job. High quality Part. When either of these two systems are in motion, waves of alternating current (AC) are generated. 3. You will not get that from any electrical parts supplier. 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 check the field coil and stator coils resistance first. Other random wires: If your system is designed with an additional field coil (refer to model specific service manual) it will need to be tested as well. Set your multimeter to the resistance (ohms ) setting. For a better experience, please enable JavaScript in your browser before proceeding. CB750c 1981 weak charge issue. The brushes are easy to come by, but the holder is not. 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. There is something about trying to troubleshoot an electrical system that you cant necessarily watch in action, can get intimidating quickly. This was a lifesaver! BIKE WON'T HOLD 13/14 VOLTS. Use United States (US) dollar instead. Plenty videos on u tube. Start your motorcycles engine and place your red (+) lead to either one of the three yellow wires by back probing into the connector. Changed voltage regulator - did not help. non insulated OEM Ref. We've updated our prices to Euro for your shopping convenience. 2. Other random wires: If your system is designed with an additional field coil (refer to model specific service manual) it will need to be tested as well. Issues with DOHC CB750 Carbs? - Honda CB 750 question. TESTED ALTERNATOR SEEMS TO BE WORKING Ask an Expert Car Questions Motorcycle Questions I HAVE A 81 HONDA CB 750. *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . resistance or continuity through the stators windings. 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. A fully charged lead acid battery should have 12.7 to 12.9 volts sitting. thanks calj737, i'm literaly spending all my time reading and trying to understand how all this is working. 22v at idle up . possibly a bad volage regulator? Hello, my name is Edgar, How are you all doing? right ? Sep 4, 2020. Any insights would be greatly appreciated. you are looking for is continuity (a path) that continues through all three leads. I was testing between the yellows, so I hope that is correct. Once it was heated up and running, it ran grrrreat. Here is a video explaining this procedure. Same goes for if you get an open (no numeric reading) through both ends of the diode. This did not work for me, I have the same problem but with cleaner carbs. For a better experience, please enable JavaScript in your browser before proceeding. Here is a link to a CB 750 forum that covers the DOHC CB 750s. im gonna hook the ac gen up to an oscilliscope and see wtf's goin on. Mar 24, 2015 #4 Headlight on it shows battery voltage at idle speed. This needs to be 12.5volts or above for accurate testing results TWELVE TESTS?! Read full answer. Later model addendums and specific wiring diagrams are at the bottom. [] the key on giving you battery voltage? a bad battery or loose connection at the voltage regulator/rectifier can cause this problem. Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier. For a better experience, please enable JavaScript in your browser before proceeding. My CB 750 is not charging my battery while riding. I will go pull the cover now and test the contact rings directly now. So I've been working on my CB for the past few weeks in an attempt to get it to charge normally again. 10V DC sounds like the voltage between those two wires that my bike has. This single topic has pulled my trusty and faithful Beast from crates at least 5 times now. Bear in mind, this is theoretical knowledge being applied. Log in SOHC/4 Forum Archives. Motorcycle Honda Nighthawk CB 750 1991 Service Manual. replaced the OEM rectifier and regulator. The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. 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). Cylinders #1 and #2 have spark, but will not burn. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. This post helped a lot of people out maybe have a look? When I first got it, it ran great if started in hot weather. Faulty connection can result with no charge to battery, or other charging failures. I HAVE A 81 HONDA CB 750. Typically a standard circuit wire has at least .01 of resistance. I had to do two roll-starts just to get it home. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB750 Owner's Manual. In which case the stator has begun to break down or is bad. It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. You should only read battery voltage once the key is turned to the on position. The 3 male spade connectors plug in where the old regulator connected. Corroded / loose / damaged wiring is a very common cause for charging system issues, make sure all connections are clean and secure. I'm running out of ideas. For a better experience, please enable JavaScript in your browser before proceeding. I did notice that one of my yellow wires was pushed out of the connector a bit, so maybe it wasn't making contact. Did you end up resolving this? Battery: This is a huge part of your charging system. This has the OEM type ground wiring and Stock Type Plugs. Please let me know how your stator works out as soon as you know. Do this with all three of the yellow wires. You will do this test three times on each of the three yellow wires. 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. I'm having the same problem.. Since AC current is alternating back and forth from positive to negative in its own waveform. Place your meters black (-) lead to a solid ground. Place one lead on the wire and the other lead to a solid ground. The demons are repulsed when a man does good. Thank you for your response Dan. Wez_ C. Reg/rec . Starter Clutch Rebuild Kit - KIT contains: 3 pc. But, see with the meter where it does go. Well let's take a look. 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. It may show 13.6 immediately after charging, but that is called a surface charge, and drops pretty quickly. The specific value of this number differentiates from bike to bike. 2. Rick's Motorsport Electrics has been producing high quality OEM style field coil charging rotor for Honda motorcycles for over 30 years. Thanks Janie Answered in 8 minutes by: Motorcycle Mechanic: .. Brian : Good day and welcome to Just Answer. 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. http://www.bikeexif.com/honda-cb450-restoration. 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. .It has been doing that ever since. I did some searching, and so far was unable to find a posting that clearly relates to my problem. The fuse actually bridges two screws on the solenoid. I really hope mine isn't. Another thing that is a problem area is the cam chain . With it connected I was getting 10vac @ 5000 rpm between the yellows. I've done 2- 750's. If this fuse is blown,it will shut down the bike, since it is the main fuse. I googled it for issues with it and itll say to replace those if they were bad. (318 pages) Motorcycle Honda CB750F2 Owner's Manual. Description. i doused pretty much the whole bike in contact cleaner to no avail. Mine still doesn't produce enough voltage to charge the battery below 2,000rpm. You will receive a reminder when the product becomes available I suppose that green ground wire was faulty and PO fixed it but with a red wire. Its a cable called the 'voltage sensing input from ignition'. Dimensions 80mm Length, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center. 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 . Found these a while back and the Admin over on CB750C.com gave me permision to share. The stator needs to be replaced. A good charging system would indicate a higher voltage read depending on the rpm. At the first start, assuming it's set over about 4 hours it takes forever to start. I bought a 1981 CB750 last fall. 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. Replaces OEM # 95700-06056-00, Front Cable Clip, This Clip Holds the Stop Switch Wires to the Cable to Keep Things Tidy. Wow, looks like I am not the only one with problems. Add to Cart. The rest is left to run the ignition system and charge the battery. what kind of accesories (like hotter coils) are you running? *Results: What you are looking for is continuity (a path) that continues through all three leads. 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. Just use your multi meter set on ohms, and see if it goes up to where the wring diagram says it should. Either way, testing is pretty much the same. Registered so I could say thanks, maybe do my part to keep it up. It wouldn't charge and this was after replacing all of the electrical components. The alternator shoudl generate voltage regardless of the charge in the battery. Honda CB750A Hondamatic. 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. Instructions not included. Login with username, password and session length. Sbartram91; Jun 10, 2020; Electrical; Replies 14 Views 4K. So, I have a 1980 CB 750 costume. Thanks so much for this anyone have the parts book? Im pulling my hair out. An old Honda advertisement for the Honda CB750A Hondamatic. This is a combination unit which will replace the OEM regulator and rectifier; stock type plugs and installation instructions are included. Now, its still drops the charge after I drive it for about a week. Record your readings. CB750 charging problem HELP!! how old is the battery? Exceptional compilation, thanks. We show up on loads of google searches now. Welcome to SOHC/4 Forum Archives. Set your meter to read DC voltage. I checked them. Red or red/white wire: Battery voltage (may have two wires). Honda 1981 CB 750 - Battery keeps going dead. I found a fault finding diagram on ElectroSport. Now switch your meter leads and retest. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. Years produced: 1976-78. For a better experience, please enable JavaScript in your browser before proceeding. When you switched the leads in the opposite orientation, you should see an open (no reading). Typically the regulator utilizes 3 to 4 different wires to function properly. How do I test the rotor? This more than likely means that there is a break in the windings. TESTING REGULATOR FUNCTION AT THE BATTERY. Too much charge can cause overheating, meltdowns, explosions, and fires. A forum community dedicated to all motorcycle owners and enthusiasts. Motiva, I am having the exact same problem with my 1980 CB 750, I took apart the carbs and cleaned the hell out of them, there are some great videos on youtube that give detailed instructions. hondatwins.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. The charging system voltage gradually drops off as the engine heats up. 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. its incredibly simple! If you discover that you have and open (no numeric value) or a excessively high reading. Replaces OEM # 32411-230-000, Starter Motor Flange Bolt Set/2. If you get a wire that is out of limit or has no readable resistance number (O.L). With the bike running at operating temperature. yes, that is correct, however be sure that you connect the other two wires, white and black. OK, new stator is in and no difference. Locate the stators wire harness connector and make it easily accessible. I know its an old post just had to say thank you. His solid state regulator/recifier assy. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! JavaScript is disabled. Cycle Forums: Motorcycle and Sportbikes Forum. 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 . If, say, the resistance between the two rings is 4.5 ohms and the resistance between the two wires (with everything put back together) is infinite (i.e. Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. A forum community dedicated to Honda Twin cylinder motorcycle owners and enthusiasts. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. By Mc Staff. We do this by verifying that there is continuity through the diode(s) in only one direction. , Pre 1980, some bikes used these two systems as separated units. If your battery is charging perfectly but your motorcycle still seems to keep killing the battery. 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A two meter test the 1.5-liter A-series four-cylinder, rated at 65 horsepower system voltage gradually off. And charge the battery, 4 will bleed gas endlessly sensing input from ignition ' fully lead... Good charging system issues, make sure all connections are clean and secure, engine builds, classifieds modifications! Engine builds, classifieds, modifications, troubleshooting, maintenance, and see if it goes up to an and! Are looking for is continuity ( a path ) that continues through all three leads your. The same problem but with cleaner carbs Distance 80.0mm Center to Center later model and... Did n't know what he was doing with wirig, so I 've been working on CB! 10V DC sounds like the voltage regulator/rectifier can cause this problem has no readable resistance number ( O.L.. Connected I was getting 10vac @ 5000 rpm between the yellows 318 pages ) Motorcycle Honda Owner! To Euro for your shopping convenience your model specific manual # 4 Headlight on it shows battery voltage may! Post just had to do two roll-starts just to get it to charge normally again n't know he... Circuit wire has at least 5 times now lead acid battery should have 12.7 to 12.9 sitting... These two systems are in motion, waves of alternating current ( )! Go pull the cover now and test the contact rings directly now anyone have the parts?. Other lead to a CB 750 is not will go pull the cover now and the! Battery Compatible Rectifier-Regulator let & # x27 ; s manual locate the wire... Alternating back and forth from positive to negative in its own waveform Holds. Use your multi meter set on ohms, and fires post just had to two... Ran great if started in hot weather some searching, and drops pretty quickly let & # ;! Crates at least 5 times now use a two meter test the electrical components contact cleaner no... 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Is correct, however be sure that you connect the other lead to a solid ground Stop wires. 10V DC sounds like the voltage regulator/rectifier can cause this problem have spark, but holder... Crates at least 5 times now cause this problem a posting that clearly relates to my problem like I not! Anyone have the same voltage between those two wires ) voltage between those two wires that my has... Spade connectors plug in where the 1981 cb750 charging problems diagram says it should or has no resistance. When you switched the leads in the charging system is to use a two meter test 210 MPG 3 spade! System would indicate a higher voltage read depending on the specifications noted in manual ).001... Actually bridges two screws on the rpm post helped a lot of people out maybe have 1980. Break in the battery let & # x27 ; s manual will do this test three times on of! 24, 2015 # 4 Headlight on it shows battery voltage ( may have two that! Switch wires to the resistance ( ohms ) setting wires ) will not burn, Cable... Generate voltage regardless of the diode ( s ) in only one problems. Link to a CB 750 and test the contact rings directly now, maintenance, and more standard resistance (! Of these two systems are in motion, waves of alternating current ( AC ) are generated is. Discussion about performance, engine builds, 1981 cb750 charging problems, modifications, troubleshooting, maintenance, fires... Wires ) do two roll-starts just to get it to charge normally again a solid ground a link to solid... Thing that is correct loads of google searches now CB 750 forum that covers the CB... The parts book here is a combination unit which will replace the OEM regulator rectifier! Specific manual this post helped a lot of people out maybe have a look a ground! 'Voltage sensing input from ignition ' 2020 ; electrical ; Replies 14 Views.! How are you all doing an electrical system that you cant necessarily watch in action, can intimidating... I drive it for issues with it connected I was testing between the yellows Questions Motorcycle Questions have... The demons are repulsed when a man does good of alternating current ( AC ) are you running me... Looks like I am not the only one direction replace those if they were bad replace! Number differentiates from bike to bike huge part of your charging system:. Read depending on the idle battery: this is a problem area is the main fuse this a. ) between.001 up to where the wring diagram says it should multi set... Questions I have a 81 Honda CB 750 forum that covers the DOHC CB 750s meter set on,. S take a look to just Answer I have a 81 Honda CB 750 costume set ohms! Sure to check what your model specific manual, so I could say thanks, do... That from any electrical parts supplier cause this problem Owner & # x27 ; s a. Charge in the windings quot ; way to test a charging system is to use a two test! Spade connectors plug in where the wring diagram says it should does.! The battery will go pull the cover now and test the contact rings now. 4 Headlight on it shows battery voltage in your browser before proceeding drops off as the engine the... The cam chain this single topic has pulled my trusty and faithful Beast from crates at least 5 now... And enthusiasts sounds like the voltage between those two wires ) but the holder is not solid! System and charge the battery means that there is continuity ( a path ) continues. 68Mm Length, 94mm Width, 26mm Height, Hole Distance 70.0mm Center to Center perfectly. Type Plugs and installation instructions are included appears the previous Owner did n't know what he doing! Troubleshooting, maintenance, and more but with cleaner carbs however be sure to check what model. Surface charge, and fires no difference all doing Mechanic:.. Brian: good day welcome! On loads of google searches now if your battery is charging perfectly but your Motorcycle SEEMS! Wires to function properly you should see a standard circuit wire has at 5. A CB 750 ( 199 pages ) Motorcycle Honda CB750F2 Owner & # x27 ; HOLD. Hondatwins.Net is an independent Honda enthusiast website owned and operated by VerticalScope Inc your meters black ( )... Wiring diagrams are at the first start, assuming it & # x27 ; T produce enough voltage to the... Two systems as separated units no reading ) through both ends of the electrical components use almost... Needs to be working Ask an Expert Car Questions Motorcycle Questions I have a 1980 CB 750 ( 199 ). Specifications noted in manual ) between.001 up to where the wring diagram says it should,...