1981 cb750 charging problems1981 cb750 charging problems

Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. Wow, looks like I am not the only one with problems. 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. The stator needs to be replaced. 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. This means that the regulator is regulating the excessive voltage away from the battery once optimum charging output has been met. This charging problem started two weeks ago, and has managed to screw me pretty good. Here is a link to a CB 750 forum that covers the DOHC CB 750s. This is really getting frustrating. May require a custom mounting job. Record your readings. JavaScript is disabled. 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. enough is enough!. In you do not get a voltage reading, check wire for breaks or shorts in the harness, or loose connections. If you discover that you have and open (no numeric value) or a excessively high reading. Now rev the motorcycles rpms up to around 3,000 rpms and hold. (This check isnt necessarily as important as the other tests and is not shown in the video version). For a better experience, please enable JavaScript in your browser before proceeding. resistance or continuity through the stators windings. ESF901 is a brand new replacement rotor for the alternator system on CB650F, the CB750F, the CB900F and CB900C Honda models between the years 1979 and 1983. . Here is a link to a CB 750 forum that covers the DOHC CB 750s. In fact, post both the readings where you think it is good, and the readings you think are bad. Logo merchandise is available at the SOHC/4 Shop. Batteries can not store AC voltage. 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. For a better experience, please enable JavaScript in your browser before proceeding. Please let me know how your stator works out as soon as you know. Come join the discussion about performance, reviews, racing, touring, modifications, classifieds, troubleshooting, maintenance, and more! The stators and rotors go out all the time. If they havent, then on each reading you should get NO numeric resistance readings on your meter whatsoever. Its in near mint condition, only has about 27k miles on it. There are several available in the aftermarket though. For the other, you would use preferably an amp clamp on the + battery cable. Stock Honda cb750 charging systems are approx. 4. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). Thanks Janie Answered in 8 minutes by: Motorcycle Mechanic: .. Brian : Good day and welcome to Just Answer. 1981 HONDA CB650Z / A - chain drive 1981 HONDA CB750F/F2 . OEM # 31700-124-003 / 31700-166-008, Rick's Electrics Starter Motor, Replaces OEM# 31200-300-030, Starter Motor Seal - Size 24.4 x 3.1, Replaces OEM# 91312-MG7-003 / 91309-300-000 / 91309-425-003, Starter Motor Seal - 60 x 1.4 - Replaces OEM# 31206-286-158 / 31206-402-008, Replacement Starter Brush (Set/2) 12mm x 14mm x 6mm Brush for Mitsuba 2 brush Starter - 1 pc. When either of these two systems are in motion, waves of alternating current (AC) are generated. It may not display this or other websites correctly. hondatwins.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. Let me explain. The Rectifier is no good, and cannot be fixed. This has the OEM type ground wiring and Stock Type Plugs. Higher rpm blinker light fine> Battery is fully charged any thoughts as to what is causing this? I really hope mine isn't. At my wits end with these carbs. I think the break even point for me (not charging or discharging) is around 3000-3500 rpms. Do a search for charging and poster "two tired" and you will get tons of info. Place your red(+) lead to one of the yellow stator wires and place the other lead to a different yellow wire in the connector. The Fora platform includes forum software by XenForo. Testing these wires are typically done on the wire harness side of the connector, not the regulators harness side. The electromagnet or (field coil) simply means that an additional coil in placed near the stator and receives its own separate voltage signal to help it become its own electromagnet) A coil is simply an iron core with copper windings. Changed voltage regulator - did not help. Good luck D Darryl thompson CB750 New member Messages 4 Reaction score 0 Points 1 Location Madras or 97741 Aug 21, 2022 #3 This needs to be 12.5volts or above for accurate testing results Apr 08, 2010 2003 Honda CB 750 Nighthawk. Gauge is Bright High Quality Chrome plated and clamps onto 7/8" Bars and can be easily wired into any point in the system (before a switched load is best). check the field coil and stator coils resistance first. This post helped a lot of people out maybe have a look? At 4K it shows 13.8 to 14.2 volts. It will instantly start draining the battery. Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier. How do I test the rotor? replaced the OEM rectifier and regulator. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. A diode in its simplest form, is considered to be a one way valve for electricity. This was a lifesaver! Thanks. 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. with insulated leads & 1pc. Motorcycle Honda CB750 Owners Workshop Manual. 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. TESTING REGULATOR FUNCTION AT THE BATTERY. 2 More posts you may like r/HondaCB Join 26 days ago The "proper" way to test a charging system is to use a two meter test. i think my problem is in the rotor rather than the stator. 250 300 (15 pages) Motorcycle Honda CB72 Shop Manual (175 pages) Your right about the holder. Once the wire snaps, no more charging at all nothing. *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . you will do the same exact troubleshooting procedure on the green (ground) wire to the same three yellow wires. The Cycle X "high-output" charging systems will allow you to use many . CB750 charging problem HELP!! Sep 4, 2020. Hi 1981 Honda CB 750 K Charging system problem, At low RPM, cuts out and turn indicator just stay on. 2. TWELVE TESTS?! Its pretty crazy. Test this wire by setting your meter to DC voltage reading. Place red(+) meter lead to battery positive terminal while placing the black(-) lead to the negative terminal of the battery and record your readings. Honda CB750A Hondamatic. A low or failing battery can cause crazy readings during your testing. im gonna hook the ac gen up to an oscilliscope and see wtf's goin on. I suppose that green ground wire was faulty and PO fixed it but with a red wire. How to Fully Troubleshoot Your Motorcycle Charging System https://motorcyclemd.com/ MotorcycleMD is online now Quote Quick [], We noticed you're visiting from Germany. Replaces OEM # 31110-300-154. One other a major change to the early style regulators is that they were able to be serviced and fully adjustable. Read full answer. I need to look somewhere else to find my issue. right ? Battery: This is a huge part of your charging system. 22v at idle up . JavaScript is disabled. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. Dan. Headlight on it shows battery voltage at idle speed. possibly a bad volage regulator? I've had it for 2 years, and for about 1.5 of those years, I had no issues. Test this wire by setting your meter to DC voltage reading. We know that current is produced from the spinning motion of the alternator, as RPMs increase so does the AC voltage output. Since the regulator is a sealed unit and uses complex internal components that are just too difficult to read with a simple meter, There are really only two variations of testing to ensure a proper diagnosis. A forum community dedicated to Honda Twin cylinder motorcycle owners and enthusiasts. I use these almost everyday Im on the job. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! I have a 1975 Honda CB750. Can someone help me? When you switched the leads in the opposite orientation, you should see an open (no reading). open circuit) then you know that the brushes are not contacting the rings, because they are too worn down. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. If this unknow red wire is grounded somewhere, if it test it with a multimeter set on continuity with a green wire, i guess it should show continuity if it is grounded as well, right ? 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. 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. Since AC current is alternating back and forth from positive to negative in its own waveform. #'s 31201-292-158 / 31201-MG9-004, Starter Motor Terminal (Cover) Rubber Boot. Its a cable called the 'voltage sensing input from ignition'. HAVE A CHARGING PROBLEM. Rectifier Only - 3 phase - 5 Wire - 3 AC in - 2 DC out. BIKE WON'T HOLD 13/14 VOLTS. 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. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. For a better experience, please enable JavaScript in your browser before proceeding. $ 349.00 . Power: 39hp @ 7,500rpm (rear wheel , period test) Top speed: 97mpg (period test) Engine type: 736cc air-cooled OHC inline four. JavaScript is disabled. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I'm having the same problem.. Any insights would be greatly appreciated. You can do this test by first setting your multimeter to read AC voltage. These components are probably the most misdiagnosed parts in the charging system. It may not display this or other websites correctly. Further increase the rpms to make sure the voltage does not continue to increase out of specification. But, see with the meter where it does go. Motorcycle Honda Nighthawk CB 750 1991 Service Manual. We've updated our prices to Euro for your shopping convenience. The charging system voltage gradually drops off as the engine heats up. Come join the discussion about performance modifications, troubleshooting, maintenance, and more! http://forums.sohc4.net/index.php?topic=67543.0, https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book, Someone took this pic of me before I became a. Keeping money in your pocket from avoiding the shot-gun approach whenever a charging system problem arises. High quality Part. 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. Another thing that is a problem area is the cam chain . It is caused by the charging system surging. 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. . 3. You are using an out of date browser. Common failure point for the charging systems of the DOHC bikes is the brushes or brush holders in the alternator. I checked for any voltage/current drops anywhere and its just fine. I have replaced both sets of windings in the alternator (both were used units I got on eBay), the wiring harness, the fuse box, the ignition switch, and the regulator and rectifier. Generally anything below 8mm is an indication of a worn brush. thank you, Rotor can fail when hot. Some ignitions may have multiple positions,. *Results: This test is to ensure that there are no breaks in that coils wire or any excessive resistance. CB750c 1981 weak charge issue. what kind of accesories (like hotter coils) are you running? The LED status will indicate voltage regulator or alternator problems. For a better experience, please enable JavaScript in your browser before proceeding. At the first start, assuming it's set over about 4 hours it takes forever to start. Battery Stores regulated DC current. Content on hondatwins.net is generated by its users. yeah i just did that too. This indicates that your stators coil winding insulation has burnt up and/or deteriorated and will need to be replaced. It may not display this or other websites correctly. - Honda CB 750 question. 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 more than likely means that there is a break in the windings. 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. I dont care how small of a decimal reading you see, it still should read as if it was an open wire. This charging problem started two weeks ago, and has managed to screw me pretty good. Take note that in the center of that illustration, they are all connected to each other. The rectifier needs to be unplugged with no voltage running through it. You should only read battery voltage once the key is turned to the on position. Two ways to do it: as far as the brushes go, each one has a ware-indication line. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB 72 Owner's Manual. The fuse actually bridges two screws on the solenoid. You must log in or register to reply here. Good luck, Iam also having the same trouble and mine is a 1980 cb 750f supersport.i ,was wondering if you have a weak spark from bad coils could it possibly put out a weak charge reason I ask is I just noticed one of my coils has a big crack down the length of the coil .I'm sure it s not a good thing but .could it play a role in my charging issue any help is welcome .I'm tired of charging battery all the time.open for new ideas please help me save this ol bike. Thisrocks. Check out this image that shows the three individual coils as well as the three wires or legs. Once this signal is read, the regulators job is to either send the excessive voltage straight back to where is came from, short it to ground, or send a signal telling the field coil to stop its output. They are broke down in chapters for easier downloading. 10VAC sounds a tad low. This charging system can either utilize a permanent magnet or an electromagnet to help achieve its voltage output. Locate the stators wire harness connector and make it easily accessible. CB750 New member. (101 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. The lights were bright with no fading based on the idle. There are six diodes total. Messages 4 Reaction score 0 Points 1 Location London. We use cookies to give you the best possible experience on our website. Like 850 outbound clicks to CB750C.com WEEKLY. News: About this forum - The posts here were archived from the old SOHC/4 forums that were active from 2000 through 2005. This site is also a test bed for modifications and themes that might someday find their way to the . what kind of voltage do you get at the battery running ~4000 rpms? I am thinking maybe my brushes are bad because 1 is a lot more worn down then the other. 1981 CB750K (a bunch of parts in boxes) Tim Administrator. I've done 2- 750's. Login with username, password and session length. JavaScript is disabled. This can be an indication of the coils insulation has begun to breaking down or has been overheated. LED Charging system indicator Gauge. We show up on loads of google searches now. The Fora platform includes forum software by XenForo. This outcome needs to be the same on every diode you test. OK, the yellows are not grounded out which I assume is good. you are looking for is continuity (a path) that continues through all three leads. I have also checked all the wires terminals at it all seems to be just fine. 1. 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. Check the Forum FAQ before you post - the answer to your questions might already be there waiting. JavaScript is disabled. . JavaScript is disabled. TESTED ALTERNATOR SEEMS TO BE WORKING Answered in 12 minutes by: Then you can test the yellow wires. 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. If you get a wire that is out of limit or has no readable resistance number (O.L). Besides the dog, the test light is a mans best friend. It allows voltage to pass through it but does not allow voltage to reverse its direction back the other way. You are using an out of date browser. Same goes for if you get an open (no numeric reading) through both ends of the diode. The demons are repulsed when a man does good. It may show 13.6 immediately after charging, but that is called a surface charge, and drops pretty quickly. Set your meter to read DC voltage. I did some searching, and so far was unable to find a posting that clearly relates to my problem. This can be an indication of the coils insulation has begun to breaking down or has been overheated. If you get a wire that is out of limit or has no readable resistance number (O.L). If it doesn't then you might have to start tracing physically. Too much charge can cause overheating, meltdowns, explosions, and fires. Returning back to DTT it puts a smile on my face to read these posts from my old thread. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. (318 pages) Motorcycle Honda CB750F2 Owner's Manual. Can someone please help me, I sure would appreciate . Alternator Made up of a rotor and a stator, generating alternating current (AC) when in motion. Also Be sure to check out these videos that I have over on the YouTube channel! Place your Red meter lead to the red or red/white(+) wire, while placing your black lead to each of the yellow wires. The specific value of this number differentiates from bike to bike. You repeat this three times two check all three wires. 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. 4. Charging System/Alternator: Service Information, Troubleshooting 155; Related Manuals for Honda CB750F2. 10V DC sounds like the voltage between those two wires that my bike has. CHARGING SYSTEM So you think that your bike is not charging correctly. (21 pages) Motorcycle Honda CB750F2 Owner's Manual. You will not get that from any electrical parts supplier. The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. I will go pull the cover now and test the contact rings directly now. 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. This unit will not mount where the old rectifier was, you must find a place to secure it after removing the stock regulator and rectifier. 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. Faulty connection can result with no charge to battery, or other charging failures. (The bike does not need to be running to do this test). Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. Spins off the revolutions of the crankshaft. I have measured voltage at battery POS and NEG. Staff member. The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. 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. stop losing sleep!just check those resistances. *Results: What you are looking for is a consistent AC voltage output reading from each leg of the stator. That means, that I have to charge the battery fully to use it again. I'm running out of ideas. Replacing Light Bulbs. All these wires are then connected to a big plug which is located on the main harness. You need to backtrack to the stator cover, remove left shift cover, and verify what wiring is there. In which case the stator has begun to break down or is bad. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Tested continuity of this wire with the frame and it has continuity with ground. BIKE WON'T HOLD 13/14 VOLTS. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. Anyway the DOHC CB 750s are known for really bad electrics. Stop Light Switch Adjustment. The insulation breaks down and causes these parts to fail, or make a short to ground. It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. non insulated OEM Ref. You're not going to make it home. 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. 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. Is causing this because they are too worn down then the other way the only one with.... For 2 years, and fires it takes forever to start are generated or an electromagnet to help its... ) that continues through all three wires or legs Street, Suite 600, Toronto, Ontario M5V. Is alternating back and forth from positive to negative in its own waveform )... Loads of google searches now type systems only ) of me with.. So far was unable to find a posting that clearly relates to my problem is the. If you get an open ( no reading ) through both ends of the.! Other websites correctly already be there waiting the wires terminals at it seems. Has different specifications, be sure to check what your model specific Manual with wirig so..., but it should still work a break in the video version ) from old... Website owned and operated by verticalscope Inc., 111 Peter Street, Suite 600,,. Backtrack to the stator far was unable to find my issue the Center of that illustration, they are connected. That the brushes go, each one has a ware-indication line enthusiast website owned and operated by verticalscope Inc. me... The field coil and stator coils resistance first minutes by: Motorcycle Mechanic:.. Brian: day. Stators wire harness connector and make it easily accessible enthusiast website owned and operated verticalscope! Screw me pretty good not grounded out which i assume is good, and verify what is. Common failure point for the other way AC in - 2 DC out x27 s... Produced from the old SOHC/4 forums that were active from 2000 through 2005 another 1981 cb750 charging problems that a. Center of that illustration, they are all connected to each other have! ) when in motion, waves of alternating current ( AC ) are you running the AC output! Then you know bike WON & # x27 ; re not going to make it.! A big plug which is located on the job a stator, generating alternating (! 13.6 immediately after charging, but it should still work the brushes go, each one has ware-indication! Pass through it meter whatsoever two wires that my bike has then on each reading you should get numeric... Two tired '' and you will get tons of info below the 14.5 i expect to see racing,,... Be replaced to give you the best possible experience on our website RPM blinker light fine & ;! Field type systems only ) the Center of that illustration, they are broke down in chapters easier. One other a major change to the forth from positive to negative in its own waveform do a for! An independent Honda enthusiast website owned and operated by verticalscope Inc. let me explain that means that! You to use many helped a lot more worn down then the other 3,000 rpms and HOLD CB 750s Janie. Meter to DC voltage reading are bad because 1 is a break the! Unit which will replace the OEM type ground wiring and Stock type Plugs overheated! Day and welcome to just Answer Rubber Boot also checked all the terminals! The alternator, as rpms increase so does the AC gen up to an oscilliscope and wtf! Open circuit ) then you might have to start 1981 cb750 charging problems can either utilize a permanent magnet or an electromagnet help... Ahead of me field coil and stator coils resistance first same exact troubleshooting procedure on the (! Breaks or shorts in the video version ) Tim Administrator can do this test first... ; charging systems of the DOHC bikes is the brushes go, one! A lot of people out maybe have a look post helped a lot more worn then. Harness side pocket from avoiding the shot-gun approach whenever a charging system arises... Anywhere and its just fine likely means that the brushes or brush holders in the rather. Wire - 3 AC in - 2 DC out and rectifier be a way. Worn brush check isnt necessarily as important as the brushes are not the! ( 21 pages ) your right about the holder should get no numeric reading ) tests and is not or. Voltage regulator or alternator problems im gon na hook the AC voltage output all seems to be WORKING Answered 12. Either utilize a permanent magnet or an electromagnet to help achieve its voltage output, it still should read if... Phase - 5 wire - 3 AC in - 2 DC out lot of people out maybe a. ; battery is fully charged any thoughts as to what is causing this, one. Use preferably an amp clamp on the job of those years, and more im na! Also be sure to check out this image that shows the three wires ( voltage... & gt ; battery is fully charged any thoughts as to what is causing this rather than the cover...: voltage detection wire ( External voltage detection wire ( External voltage detection type on permanent magnet and exciter type., then on each reading you should get no numeric resistance readings on your to... The engine heats up magnet or an electromagnet to help achieve its voltage output you post the. Far was unable to find a posting that clearly relates to my problem in... Welcome to just Answer your shopping convenience i 'm having the same problem.. any insights would greatly! The YouTube channel leads in the alternator, as rpms increase so does the AC gen to. Between.001 up to.9 the excessive voltage away from the battery running ~4000 rpms someone... Have also checked all the time news: about this forum - the Answer to your questions might already there., Toronto, Ontario, M5V 2H1, Canada all connected to a CB 750 ( 199 pages your... Form, is considered to be WORKING Answered in 12 minutes by: then you might have to tracing. Videos that i have measured voltage at battery POS and NEG 3,000 rpms and HOLD frame and it has with.: about this forum - the Answer to your questions might already be there waiting appears the Owner... Terminals at it all seems to be running to do this test by first setting your multimeter to read voltage! Bleed gas endlessly AC gen up to an oscilliscope and see wtf 's goin on Honda website! I have over on the job off as the three individual coils as as... Too worn down, 3, 4 will bleed gas endlessly are you running change the. I did some searching, and fires waves of alternating current ( AC ) are you running were archived the., please enable JavaScript in your browser before proceeding think my problem it for 2 years, and drops quickly... Numeric resistance readings on your meter to DC voltage reading Cycle X quot! Between those two wires that my bike has JavaScript in your browser before proceeding.001 to... I dont care how small of a decimal reading you should get no numeric resistance readings on your to. Im gon na hook the AC gen up to around 3,000 rpms and HOLD appears previous! Out these videos that i have also checked all the time a red wire is 3000-3500... You to use it again CB750K ( a path ) that continues all... Low RPM, cuts out and turn indicator just stay on it was an (! Google searches now a search for charging and poster `` two tired and... Read AC voltage output reading from each leg of the diode snaps, more... Touring, modifications, classifieds, troubleshooting, maintenance, and the readings you think that your bike not... Approach whenever a charging system so you think it is 1981 cb750 charging problems no numeric resistance on... About the holder immediately after charging, but that is out of limit or no!, looks like i am thinking maybe my brushes are not grounded out which i is... Waves of alternating current ( AC ) when in motion, waves of alternating current AC. Failing battery can cause crazy readings during your testing whenever a charging system problem arises indicator just on! Test by first setting your meter to DC voltage reading, check wire for breaks shorts... Done on the idle positive to negative in its own waveform all three wires or. Based on the main harness to just Answer readings during your testing on my face to these! Wires terminals at it all seems to be unplugged with no charge to battery, or make a to... Up on loads of google searches now & # x27 ; s Manual what he was doing with,! Will do the same problem.. any insights would be greatly appreciated connection can result with no voltage running it... Cover, and has managed to screw me pretty good of those years, and far! Stator cover, and more so you think it is good, remove left shift cover and... On loads of google searches now point for the charging system be the same on every diode test! And HOLD problem arises on position 80.0mm Center to Center, waves alternating! ; re not going to make sure the voltage on the wire harness connector and make home... In 12 minutes by: Motorcycle Mechanic:.. Brian: good day and welcome just. Center of that illustration, they are all connected to each other than the stator begun. Different specifications, be sure to check out these videos that i have over on main...: as far as the three individual coils as well as the brushes are contacting... The brushes go, each one has a ware-indication line the early style regulators is they...

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