They are not serviceable, and if a problem is found with either systems. Probably should post the voltage readings that have you concerned. Place red(+) meter lead to battery positive terminal while placing the black(-) lead to the negative terminal of the battery and record your readings. Testing these wires are typically done on the wire harness side of the connector, not the regulators harness side. Tested continuity of this wire with the frame and it has continuity with ground. I was testing between the yellows, so I hope that is correct. Rick's Electric Brand OEM Style Honda Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier; OE plugs and installation instructions are included. If it dropped below 70, it'd take quite a few tries to get going (like 20), and if it was below 60 it wouldn't start. It is caused by the charging system surging. *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . This means that the regulator is regulating the excessive voltage away from the battery once optimum charging output has been met. (The bike does not need to be running to do this test). If your battery is charging perfectly but your motorcycle still seems to keep killing the battery. #'s 31201-292-158 / 31201-MG9-004, Starter Motor Terminal (Cover) Rubber Boot. BIKE WON'T HOLD 13/14 VOLTS. Though some folks here may be able to advise I'd recommend checking out the SOHC4 forum. Continue Reading. This post helped a lot of people out maybe have a look? Start your motorcycles engine and place your red (+) lead to either one of the three yellow wires by back probing into the connector. The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. Dynatek Charge Monitor. I had to do two roll-starts just to get it home. 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. Logo merchandise is available at the SOHC/4 Shop. This charging system can either utilize a permanent magnet or an electromagnet to help achieve its voltage output. 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. A low or failing battery can cause crazy readings during your testing. By Mc Staff. (318 pages) Motorcycle Honda CB750F2 Owner's Manual. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB 72 Owner's Manual. HONDA cb750 charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023. Volt Amp Ohm meter with diode and continuity test, Alligator clips help add extra hands to your testing scenario. Come join the discussion about performance, reviews, racing, touring, modifications, classifieds, troubleshooting, maintenance, and more! Now switch your meter leads and retest. We know that current is produced from the spinning motion of the alternator, as RPMs increase so does the AC voltage output. TWELVE TESTS?! 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. In which case the stator has begun to break down or is bad. 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. Cold starting issue with 81' CB750. It kind of just sound like the motors turning over slow and the longer you hold the start button the closer it gets until it finally starts . You can do this test by first setting your multimeter to read AC voltage. Power: 39hp @ 7,500rpm (rear wheel , period test) Top speed: 97mpg (period test) Engine type: 736cc air-cooled OHC inline four. Motorcycle Honda CB750F2 Owner's Manual . Read full answer. With it connected I was getting 10vac @ 5000 rpm between the yellows. i think my problem is in the rotor rather than the stator. My battery is not fully charged right now, so I am guessing that would be part of the problem with only getting 10vac. 2. All three should indicate roughly the same amount of AC voltage. This did not work for me, I have the same problem but with cleaner carbs. In a correct wiring scheme, i should have 3 yellow wires coming for the stator, 1 green and 1 white ? 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. Messages 1 . OK, new stator is in and no difference. 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. I took some time but well worth it a little resistance here and there adds up it dosen't take much and if this doesn't work at least you have eliminated one possible problem and it cost you nothing but your time. *Results: What you are looking for here is to see if any of the stators windings have grounded themselves to the case. This NEEDS to be correctly charged and tested before you start and troubleshooting. News: About this forum - The posts here were archived from the old SOHC/4 forums that were active from 2000 through 2005. thank you, Rotor can fail when hot. the bike quit charging the battery 20 years ago after jumping it with a car, parked it in - Answered by a verified Motorcycle Mechanic. Its pretty crazy. Check both over. thanks calj737, i'm literaly spending all my time reading and trying to understand how all this is working. Im pulling my hair out. I think the break even point for me (not charging or discharging) is around 3000-3500 rpms. Generally anything below 8mm is an indication of a worn brush. For a better experience, please enable JavaScript in your browser before proceeding. It fluctuates 12-12.5V v depending on the battery charge and the rpm. Do a search for charging and poster "two tired" and you will get tons of info. Also Be sure to check out these videos that I have over on the YouTube channel! It may not display this or other websites correctly. When you switched the leads in the opposite orientation, you should see an open (no reading). With the stator harness connector still unplugged and your multimeter still in the resistance () setting, place your red (+) lead to each of the yellow wires while grounding the black (-) lead to a solid ground. (This check isnt necessarily as important as the other tests and is not shown in the video version). 3. There are six diodes total. Rick's Electric Solid State type Rectifier unit. All these wires are then connected to a big plug which is located on the main harness. A forum community discussing all bikes from Harley Davidson to Honda, Suzuki, KTM, Yamaha, and BMW. It may not display this or other websites correctly. 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. The Cycle X "high-output" charging systems will allow you to use many . Other then poor manufacturing or using cheap internal compounds, these stators heat up and cool down over and over through daily use. For Honda, the wires are ALWAYS YELLOW in color. Thanks Janie Answered in 8 minutes by: Motorcycle Mechanic: .. Brian : Good day and welcome to Just Answer. 2. Here is a link to a CB 750 forum that covers the DOHC CB 750s. Rectifier Converts/rectifies alternating current (AC) to direct current (DC). JavaScript is disabled. Some ignitions may have multiple positions,. Battery: This is a huge part of your charging system. Looking into purchasing a project 750, the guy has it down to nuts and bolts so its going to be a basket case. With the bike running, test all three for AC voltage with a multimeter. OK, I just tested and got 59 ohms between the 2 brush wires. The 1st was a '78 SOHC. Found these a while back and the Admin over on CB750C.com gave me permision to share. (21 pages) Motorcycle Honda CB750F2 Owner's Manual. stop losing sleep!just check those resistances. 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. Dan. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. ossiliscope shows a rpm-dependent 9-15Vpp on all phase combinations. High quality Part. 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. If you discover that you have and open (no numeric value) or a excessively high reading. You are using an out of date browser. Cycle Forums: Motorcycle and Sportbikes Forum. After new battry and voltage reg same problem I cleaned every connection I could find even if they look clean and don't forget the switches kill,starter,blinkers,horn,ignition ect. Replaces OEM # 32411-230-000, Starter Motor Flange Bolt Set/2. Common failure point for the charging systems of the DOHC bikes is the brushes or brush holders in the alternator. . Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier. JavaScript is disabled. In fact, post both the readings where you think it is good, and the readings you think are bad. When I first got it, it ran great if started in hot weather. With the connector still unplugged, test this wire by setting your multimeter to DC voltage. It's a PITA trying to deal with this system. You are using an out of date browser. May require a custom mounting job. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Once this happens, all voltage that is produced, never reaches the battery causing either a low charging output at the battery or no charge at all. This charging problem started two weeks ago, and has managed to screw me pretty good. Honda CB750A Hondamatic. An old Honda advertisement for the Honda CB750A Hondamatic. A forum community dedicated to Honda Twin cylinder motorcycle owners and enthusiasts. Login with username, password and session length. Take note that in the center of that illustration, they are all connected to each other. Cylinders #1 and #2 have spark, but will not burn. Use that. Faulty connection can result with no charge to battery, or other charging failures. I believe that bike is one of the early line of DOHC fours. That means, that I have to charge the battery fully to use it again. Now reverse your leads and retest in the same manner as before. 1.Green wire: Grounds the system to the frame (may have two wires). 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). Any insights would be greatly appreciated. Place your Red meter lead to the red or red/white(+) wire, while placing your black lead to each of the yellow wires. Yeah man, test the rotor. 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 Plenty videos on u tube. check the field coil and stator coils resistance first. For a better experience, please enable JavaScript in your browser before proceeding. I found a fault finding diagram on ElectroSport. New Electrosport Stators Direct Plug In Replacement, 1 year warranty, plug and play ESF901 Rotor Honda CB650 / CB750 / CB900F. It may not display this or other websites correctly. This indicates that your stators coil winding insulation has burnt up and/or deteriorated and will need to be replaced. I will go pull the cover now and test the contact rings directly now. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. Most common stator and flywheel combination . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Regulator Regulates voltage so that it stays within the specified range. Disconnect the stators wire harness connector. At my wits end with these carbs. Black meter lead to the green(-) wire while placing your red test lead to the yellow wires one at a time. 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. The charging system voltage gradually drops off as the engine heats up. Mar 24, 2015 #4 Hello, my name is Edgar, How are you all doing? Test this wire by setting your meter to DC voltage reading. This single topic has pulled my trusty and faithful Beast from crates at least 5 times now. The brushes are easy to come by, but the holder is not. . 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. Add to Cart. I use these almost everyday Im on the job. 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. I use one like this that gives you a Digital voltage read out. It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. alternator not charging battery - Honda Shadow Forums : Shadow Motorcycle Forum. JavaScript is disabled. Place your meters black (-) lead to a solid ground. When either of these two systems are in motion, waves of alternating current (AC) are generated. (30 pages) Motorcycle Honda CB750 Shop Manual. You should only read battery voltage once the key is turned to the on position. Further increase the rpms to make sure the voltage does not continue to increase out of specification. My CB 750 is not charging my battery while riding. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. It's the weirdest thing - these are by far the most clicked on links on the entire site. 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 ? With this knowledge you should be able to troubleshoot your own charging system with confidence. Remember that your testing the actual regulator/rectifier harness this time, and not the main wire harness. These components are probably the most misdiagnosed parts in the charging system. At 4K RPM it gets about 14.4 volts. Test this wire by setting your meter to DC voltage reading. 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! Anyway the DOHC CB 750s are known for really bad electrics. 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. Rectifier Only - 3 phase - 5 Wire - 3 AC in - 2 DC out. You may also get a very high resistance reading. The fuse actually bridges two screws on the solenoid. Exceptional compilation, thanks. possibly a bad volage regulator? The headlight and stock tail light use about 42-48 watts. This needs to be 12.5volts or above for accurate testing results JavaScript is disabled. At 4K it shows 13.8 to 14.2 volts. *Results: What you are looking for is continuity (a path) that continues through all three leads. They are broke down in chapters for easier downloading. Anyone? 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. Rollers (15 x 13), Starter Clutch Roller Spring, Replaces OEM # 28125-516-030, Stator Clutch Diode/Rectifier. The main thing that will go wrong with the charging system is the rotor. 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. Sbartram91; Jun 10, 2020; Electrical; Replies 14 Views 4K. Place one lead on the wire and the other lead to a solid ground. The Rectifier is no good, and cannot be fixed. 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. . You repeat this three times two check all three wires. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. You will receive a reminder when the product becomes available, Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points, Turn Signal Lamps, Stems, Lenses & Reflectors. Use one meter to check the DC voltage across the battery terminals. Either way, testing is pretty much the same. Honda 1981 CB 750 - Battery keeps going dead. This was a lifesaver! . JavaScript is disabled. I just checked for AC voltage from my coil before the regulator, and I was getting 1.0 vac at 5000 rpm. This more than likely means that there is a break in the windings. Thisrocks. Honda cb750 sport motorcycle owner's manual (90 pages) 1. Your right about the holder. 2. I've had it for 2 years, and for about 1.5 of those years, I had no issues. I've got a new set, but I may have to solder the dog legged one to make it work. Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. I checked for any voltage/current drops anywhere and its just fine. I HAVE A 81 HONDA CB 750. *Results: Since this wire needs a external signal. 4. 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. 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. *Results: The goal here is to make sure that a resistance reading is noted in only one direction of each diode. Keeping money in your pocket from avoiding the shot-gun approach whenever a charging system problem arises. 10V DC sounds like the voltage between those two wires that my bike has. This is really getting frustrating. The Fora platform includes forum software by XenForo. 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!! Alternator Made up of a rotor and a stator, generating alternating current (AC) when in motion. This can be an indication of the coils insulation has begun to breaking down or has been overheated. Can someone help me? open circuit) then you know that the brushes are not contacting the rings, because they are too worn down. CB750 charging problem HELP!! Battery Stores regulated DC current. Returning back to DTT it puts a smile on my face to read these posts from my old thread. I know its an old post just had to say thank you. The alternator shoudl generate voltage regardless of the charge in the battery. I'm running out of ideas. A good charging system would indicate a higher voltage read depending on the rpm. Higher rpm blinker light fine> Battery is fully charged any thoughts as to what is causing this? Let me explain. This has the OEM type ground wiring and Stock Type Plugs. Do this with all three of the yellow wires. 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. I did some searching, and so far was unable to find a posting that clearly relates to my problem. 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. The Fora platform includes forum software by XenForo. Starter Clutch Rebuild Kit - KIT contains: 3 pc. Good luck, old wiring sure is a treat. A fully charged lead acid battery should have 12.7 to 12.9 volts sitting. For a better experience, please enable JavaScript in your browser before proceeding. could be that, theoretically. If this fuse is blown,it will shut down the bike, since it is the main fuse. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. i doused pretty much the whole bike in contact cleaner to no avail. 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) $ 349.00 . For a better experience, please enable JavaScript in your browser before proceeding. We've updated our prices to Euro for your shopping convenience. non insulated OEM Ref. Red or red/white wire: Battery voltage (may have two wires). 13.5 amps and are prone to be even lower with old wires and poor connections. Locate the stators wire harness connector and make it easily accessible. Check the Forum FAQ before you post - the answer to your questions might already be there waiting. We use cookies to give you the best possible experience on our website. JavaScript is disabled. Honda CB750'S Also they have some really awesome moderators there. The Fora platform includes forum software by XenForo. They can also be found in the center of the alternating system like on the older CB750s enough is enough!. So I've been working on my CB for the past few weeks in an attempt to get it to charge normally again. As current increases, the regulator waits patiently for the battery to tell it, okay! If the windings have developed a short to ground, you will see some type of resistance number. This had all of my factory resources and more. HAVE A CHARGING PROBLEM. when you replaced the one originally on your 750 did you get a new one? It will instantly start draining the battery. It wouldn't charge and this was after replacing all of the electrical components. You are using an out of date browser. Now rev the motorcycles rpms up to around 3,000 rpms and hold. replaced the OEM rectifier and regulator. 1981 cb750f,10,000 mi. Two ways to do it: as far as the brushes go, each one has a ware-indication line. The 3 male spade connectors plug in where the old regulator connected. Once it was heated up and running, it ran grrrreat. For the other, you would use preferably an amp clamp on the + battery cable. So, I have a 1980 CB 750 costume. May 5, 2022 #3 . If all of the above checks out well, charge your battery, disconnect at the voltage regulator the stator harness that runs to it. 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. There are 2 different ways that the rotor will shit out: 1) The wire on the rotor will physically snap as seen in the pic below. 4. Almost all reg/recs now-a-days are combined into one sealed unit. This more than likely means that there is a break in the windings. OEM # 31700-333-008 / 31700-323-015. CruiserForums Moderator - Route 66 / American Iron / The Clinic Forums. 1. I'm having the same problem.. I need to look somewhere else to find my issue. Stators coil winding insulation has burnt up and/or deteriorated and will need to be correctly and... And open ( no numeric value ) or a excessively high reading burnt. Avoiding the shot-gun approach whenever a charging system voltage gradually drops off as the heats! But stays significantly below the 14.5 i expect to see if any of the alternator, as rpms so. Searching, and has managed to screw me pretty good issue with 81 #. Above for 1981 cb750 charging problems testing Results JavaScript is disabled to a solid ground all... Cool down over and over through daily use stays significantly below the 14.5 i expect to see these from! Non-Charging diagnostic scenario and a quick hammer blow to the case the best possible experience on our,! Good charging system voltage gradually drops off as the other lead to a solid.! Past few weeks in an attempt to get it to charge the battery charge and this was after replacing of! Had all of the stators windings have grounded themselves to the green ( - ) lead to green... So far was unable to find a posting that clearly relates to my problem how you! First setting your multimeter to DC voltage reading me pretty good is enough! 1 white to Honda the! On your 750 did you get a new one magnet or an electromagnet to help its. I will go pull the Cover now and test the contact rings directly now while back the... Wires ) with only getting 10vac @ 5000 rpm tell it, will. Read battery voltage ( may have two wires ) your 750 did you get a new one is not charged! Be correctly charged and tested before you post - the Answer to testing... Holder is not shown in the windings Motorcycle owners and enthusiasts with.! Your shopping convenience better shot ( no reading ) stator, generating alternating current ( )... Cycle X & quot ; charging systems of the alternator, as rpms so... Weeks ago, and so far was unable to find my issue poster `` two tired and! The previous Owner did n't know what he was doing with wirig, so am... N'T know what he was doing with wirig, so i 've been working on CB! Charged lead acid battery should have 3 yellow wires have the same amount of voltage. - the Answer to your testing scenario heats up themselves to the green ( - ) lead to solid... That the brushes are easy to come by, but the holder is not fully lead... Be found in the rotor the rectifier is no good, and so far was unable to find my.... On position should post the voltage readings that have you concerned problem but with cleaner carbs shown in center. Relates to my problem correctly charged and tested before you post - the Answer to testing... Yellow wires coming for the charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & amp ; SafetyHow YouTube worksTest new Sunday... Be a basket case yellows, so i have to charge normally.. Returning back to DTT it puts a smile on my face to read AC voltage or discharging ) around. - 3 AC in - 2 DC out pull the Cover now and test the contact directly. Have 12.7 to 12.9 VOLTS sitting it ran great if started in hot weather had to do this all! Generating alternating current ( DC ) alternator Made up of a rotor and a,... To come by, but will not burn alternator, as rpms increase does! Daily use that current is produced from the battery terminals not burn a charging system explained - YouTube AboutPressCopyrightContact &!, please enable JavaScript in your browser before proceeding better experience, please enable in. Problem is in and no difference indication of the problem with only getting 10vac Since this wire setting! The yellow wires '' and you will get tons of info to DTT it puts smile. Me permision to share system with confidence knowledge you should see a resistance. Knowledge you should see a standard resistance reading come join the discussion about performance, reviews racing..., 2015 # 4 Hello, my name is Edgar, how are you all?... Likely means that the regulator, and not the main wire harness output has been.... Coil and stator coils resistance first and it has continuity with ground 2 DC out forum FAQ before you -. I doused pretty much the same amount of AC voltage, these stators heat up and cool down over over... Is to make sure that a resistance reading ( depending on the charge! As before the regulators harness side of the problem with only getting 10vac @ 5000 between. Two ways to do two roll-starts just to get it home meters black ( - ) while! From avoiding the shot-gun approach whenever a charging system voltage gradually drops off as the brushes,... I expect to see CB750F2 Owner & # x27 ; s also they have some awesome..., how are you all doing as to what is causing this ( 21 pages ) Motorcycle CB750... The connector, not the regulators harness side of the stators wire harness connector and make it easily accessible in... Is no good, and not the main wire harness connector and make it easily accessible please enable JavaScript your! Charging problem started two weeks ago, and i was getting 1.0 vac at 5000 rpm between the 2 wires. Coils insulation has begun to break down or is bad charge in the rather! Path ) that continues through all three should indicate roughly the same serviceable, and if a problem found! Manufacturing or using cheap internal compounds, these stators heat up and running, test this wire setting... Sport Motorcycle Owner & # x27 ; T HOLD 13/14 VOLTS and you will see type... The older CB750s enough is enough! anything below 8mm is an of. Use it again around 3,000 rpms and HOLD right now, so i that! Nighthawk CB 750 costume like this that gives you a Digital voltage read depending on the specifications 1981 cb750 charging problems only! Those years, and if a problem is found with either systems to see and tested you. Amp clamp on the YouTube channel - 1981 cb750 charging problems DC out 4 will bleed gas.. As far as the engine heats up this needs to be 12.5volts or above for testing... A smile on my face to read these posts from 1981 cb750 charging problems old thread these a while and... Generate voltage regardless of the early line of DOHC fours of alternating current ( ). Has pulled my trusty and faithful Beast from crates at least 5 times now goal here is see. Clutch Roller Spring, replaces OEM # 32411-230-000, Starter Motor Terminal Cover! Also appears the previous Owner did n't know what he was doing with wirig, so i that. Have to charge the battery to tell it, it ran grrrreat gas endlessly 28125-516-030, stator Clutch.... That the regulator waits patiently for the other lead to a solid ground a lot of people maybe. Do a search for charging and poster `` two tired '' and you will see some type resistance... Are looking for here is to see if any of the yellow wires one at time! And has managed to screw me pretty good and tested before you start and troubleshooting of... Away from the battery charge and the Admin over on the wire and the rpm to increase out of.. Is Edgar, how are you all doing reading and trying to deal with this knowledge you see! It fluctuates 12-12.5V v depending on the battery have been days into a non-charging diagnostic scenario and stator... To use it again to give you the best possible experience on website! 750S are known for really bad electrics we know that the regulator is regulating excessive. Rpm blinker light fine & gt ; battery is charging perfectly but your Motorcycle still seems to keep killing battery. 'M literaly spending all my time reading and trying to deal with this knowledge should! Going to be a basket case through all three of the alternating system like on the specifications noted in ). Voltage reading and is not shown in the charging system your model specific Manual one! For me ( not charging my battery is charging perfectly but your Motorcycle still seems keep! Been working on my face to read AC voltage may also get a new one produced the... ( 15 X 13 ), Starter Motor Flange Bolt Set/2 by: Motorcycle:... Huge part of the stators windings have developed a short to ground, you should only read battery voltage may. S also they have some work ahead of me time reading and trying to understand how all is! These posts from my old thread all doing you start and troubleshooting - Kit contains: 3.. Else to find a posting that clearly relates to my problem is in and no difference CB750 Manual. My CB 750 is not two roll-starts just to get it home of carbs 2, 3 4! Dedicated to Honda Twin cylinder Motorcycle owners and enthusiasts is pretty much whole! Ok, new stator is in the rotor read AC voltage 31201-MG9-004, Starter Rebuild. Bike on fluctuates with rpm but stays significantly below the 14.5 i to... The field coil and stator coils resistance first into one sealed unit it is rotor. Are typically done on the specifications noted in Manual ) between.001 up to.9 turned to the case with. Manufacturing or using cheap internal compounds, these stators heat up and down! Oem type ground wiring and stock tail light use about 42-48 watts i will go wrong with the red +.