Logo merchandise is available at the SOHC/4 Shop. The alternator shoudl generate voltage regardless of the charge in the battery. The 1st was a '78 SOHC. . Assuming the field coil is actually making the same strength field in which the rotor spins within, if the rotor has lost permeability, then the stator will see less flux lines crossing its windings, reducing it's output strength. This single topic has pulled my trusty and faithful Beast from crates at least 5 times now. Login with username, password and session length. 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. Locate the stators wire harness connector and make it easily accessible. Set your meter to read DC voltage. Honda CB750'S Also they have some really awesome moderators there. Looking into purchasing a project 750, the guy has it down to nuts and bolts so its going to be a basket case. So I bought a 1981 CB750 about a year ago. hondatwins.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. Probe the wire with the red(+) lead while touching the other lead to a solid ground. stop losing sleep!just check those resistances. Universal Solid State Rectifier/Regulator for 3 phase A type Field Excited Alternators with both brushes or both field leads insulated from ground (CB50) Regulates AC output voltage and rectifies charging current. Use United States (US) dollar instead. This more than likely means that there is a break in the windings. Test this wire by setting your meter to DC voltage reading. im gonna hook the ac gen up to an oscilliscope and see wtf's goin on. Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. You will receive a reminder when the product becomes available, Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points, Turn Signal Lamps, Stems, Lenses & Reflectors. Rick's Electric Brand Lithium Ion Battery Compatible Rectifier-Regulator. Once it was heated up and running, it ran grrrreat. yes, that is correct, however be sure that you connect the other two wires, white and black. i think my problem is in the rotor rather than the stator. JavaScript is disabled. Record your readings. Use that. There are several available in the aftermarket though. 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'. Stock Honda cb750 charging systems are approx. Too much charge can cause overheating, meltdowns, explosions, and fires. Its pretty crazy. In which case the stator has begun to break down or is bad. With it connected I was getting 10vac @ 5000 rpm between the yellows. Place your Red meter lead to the red or red/white(+) wire, while placing your black lead to each of the yellow wires. Can someone help me? HONDA cb750 charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023. The Real Housewives of Atlanta The Bachelor Sister Wives 90 Day Fiance Wife Swap The Amazing Race Australia Married at First Sight The Real Housewives of Dallas My 600-lb Life Last Week Tonight with John Oliver 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. Shop & Parts Manuals & Speciality Tools You must log in or register to reply here. Mar 24, 2015 #4 The 3 male spade connectors plug in where the old regulator connected. Found these a while back and the Admin over on CB750C.com gave me permision to share. 2. The rest is left to run the ignition system and charge the battery. You repeat this three times two check all three wires. If you discover that you have and open (no numeric value) or a excessively high reading. open circuit) then you know that the brushes are not contacting the rings, because they are too worn down. what kind of voltage do you get at the battery running ~4000 rpms? An old Honda advertisement for the Honda CB750A Hondamatic. Motorcycle Honda CB750F2 Owner's Manual . 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. . October 14, 2022, 04:29:16 AM. Anyone? *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . Once the wire snaps, no more charging at all nothing. 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. It may not display this or other websites correctly. My CB 750 is not charging my battery while riding. Regulates AC output voltage and rectifies charging current. Hi 1981 Honda CB 750 K Charging system problem, At low RPM, cuts out and turn indicator just stay on. Keep in mind that this process is happening faster then you can see. 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. Never been laid down or anything of that sort. I have an 82 750sc and it is driving me nuts. (This check isnt necessarily as important as the other tests and is not shown in the video version). This did not work for me, I have the same problem but with cleaner carbs. 1981 HONDA CB650Z / A - chain drive 1981 HONDA CB750F/F2 . Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! *Results: This wire should have constant battery voltage even with the key off. TESTED ALTERNATOR SEEMS TO BE WORKING Answered in 12 minutes by: It fluctuates 12-12.5V v depending on the battery charge and the rpm. Generally anything below 8mm is an indication of a worn brush. $ 349.00 . Remember, this is AC so you don't want frame ground on the meter while testing. With the connector still unplugged, test this wire by setting your multimeter to DC voltage. With the bike running at operating temperature. Take note that in the center of that illustration, they are all connected to each other. To accomplish this switch, the rectifier is made up of diodes. Now switch your meter leads and retest. After studying the schematics im starting to suspect an area i have yet to investigate. It's a PITA trying to deal with this system. You will receive a reminder when the product becomes available 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. 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. Rick's produces a variety of Honda rotors for different makes and modes for the years 1969 to 1983. Instructions not included. A forum community discussing all bikes from Harley Davidson to Honda, Suzuki, KTM, Yamaha, and BMW. 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. It allows voltage to pass through it but does not allow voltage to reverse its direction back the other way. Anyone with info let me know. All three should indicate roughly the same amount of AC voltage. The stator needs to be replaced. Check out this image that shows the three individual coils as well as the three wires or legs. Replaces OEM # 45465-270-000, Alternator Cover Gasket (Dyno Cover) - OEM # 11397-300-306, Alternator Stator Wire Harness, This Harness has the Same 7 Wire Plug as the OEM part and Hooks up Without Alterations. 2. There will be three yellow AC wires in the harness. Problem solved. Honda CB750A Hondamatic. Talk to Tony at Oregonmotorcycleparts.com. TWELVE TESTS?! I've done 2- 750's. If not, check for breaks in the harness, or loose connections. For Honda, the wires are ALWAYS YELLOW in color. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. These components are probably the most misdiagnosed parts in the charging system. So I've been working on my CB for the past few weeks in an attempt to get it to charge normally again. So, I have a 1980 CB 750 costume. The stator needs to be replaced. But, see with the meter where it does go. 4. The charging system voltage gradually drops off as the engine heats up. Honda 1981 CB 750 - Battery keeps going dead. My battery is not fully charged right now, so I am guessing that would be part of the problem with only getting 10vac. Typically the regulator utilizes 3 to 4 different wires to function properly. Disconnect the stators wire harness connector. Welcome to SOHC/4 Forum Archives. Like 850 outbound clicks to CB750C.com WEEKLY. Its in near mint condition, only has about 27k miles on it. HAVE A CHARGING PROBLEM. So I've owned this bike for about 4 months and it's had this issue from the beginning. The fuse actually bridges two screws on the solenoid. In which case the stator has begun to break down or is bad. Motorcycle Honda CB750 Owners Workshop Manual. 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. I've had it for 2 years, and for about 1.5 of those years, I had no issues. You are using an out of date browser. The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. 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. First, I'm not receiving any compensation. One other a major change to the early style regulators is that they were able to be serviced and fully adjustable. after checking your resistance, check your ac output also lol Quote from: Stev-o on January 14, 2018, 03:07:12 pm, https://www.youtube.com/watch?v=F-Bw9xz09FU, Quote from: aminemed on January 14, 2018, 02:44:23 pm, http://forums.sohc4.net/index.php?topic=126401.0, http://forums.sohc4.net/index.php?topic=132935.0, https://www.cmsnl.com/classic-honda-fansite/honda_wiring_diagrams/CB750(K3-K7).jpg. The specific value of this number differentiates from bike to bike. Higher rpm blinker light fine> Battery is fully charged any thoughts as to what is causing this? 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 . This needs to be 12.5volts or above for accurate testing results The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. A low or failing battery can cause crazy readings during your testing. Exceptional compilation, thanks. when you replaced the one originally on your 750 did you get a new one? 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. It had starting issues at the time. Read full answer. Here is a link to a CB 750 forum that covers the DOHC CB 750s. Years produced: 1976-78. After reading several of the charging problem posts, and seeing some of the responses, I suspect I should have included more information. http://www.bikeexif.com/honda-cb450-restoration. I need to look somewhere else to find my issue. Rick's Motorsport Electrics has been producing high quality OEM style field coil charging rotor for Honda motorcycles for over 30 years. After installing, I had a constant voltage @ 14v. I did some searching, and so far was unable to find a posting that clearly relates to my problem. 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. I checked for any voltage/current drops anywhere and its just fine. Place your meters black (-) lead to a solid ground. Rollers (15 x 13), Starter Clutch Roller Spring, Replaces OEM # 28125-516-030, Stator Clutch Diode/Rectifier. Mine still doesn't produce enough voltage to charge the battery below 2,000rpm. Ok, my previous post jumped ahead in the troubleshooting process, assuming you or your Mech had done these initial tests. There are six diodes total. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. 3. The demons are repulsed when a man does good. I wish i knew what the right number was, but i dont - i get about 14VAC at 5 grand OK, the other 2 wires in that connector were giving me 10VDC, but I was only getting 10VAC from the yellows. *Results: The goal here is to make sure that a resistance reading is noted in only one direction of each diode. Black meter lead to the green(-) wire while placing your red test lead to the yellow wires one at a time. Most common stator and flywheel combination . You are using an out of date browser. 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. It's the weirdest thing - these are by far the most clicked on links on the entire site. I had a similar problem with my 750. Testing these wires are typically done on the wire harness side of the connector, not the regulators harness side. Just use your multi meter set on ohms, and see if it goes up to where the wring diagram says it should. If you get a resistance reading through both ways on the diode. Battery Charging. , Pre 1980, some bikes used these two systems as separated units. Typically a standard circuit wire has at least .01 of resistance. 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. hondatwins.net is not in any way affiliated with Honda Motor Company, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I had to do two roll-starts just to get it home. Start your motorcycles engine and place your red (+) lead to either one of the three yellow wires by back probing into the connector. 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. For a better experience, please enable JavaScript in your browser before proceeding. With the bike running, test all three for AC voltage with a multimeter. Wez_ C. Reg/rec . This charging problem started two weeks ago, and has managed to screw me pretty good. Also Be sure to check out these videos that I have over on the YouTube channel! Changed voltage regulator - did not help. Sep 4, 2020. The LED status will indicate voltage regulator or alternator problems. BIKE WON'T HOLD 13/14 VOLTS. Alternator Rotor Puller - 20mm x M1.5 Right Hand Thread Puller for pulling internal thread rotors. Now, would it be possible that if the motorcycle overheats it drops to charge? replaced the OEM rectifier and regulator. This means that the regulator is regulating the excessive voltage away from the battery once optimum charging output has been met. 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. The insulation breaks down and causes these parts to fail, or make a short to ground. Same goes for if you get an open (no numeric reading) through both ends of the diode. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). Login with username, password and session length. Now rev the motorcycles rpms up to around 3,000 rpms and hold. JavaScript is disabled. OEM # 31700-333-008 / 31700-323-015. Set your multimeter to the resistance (ohms ) setting. Regulators are made up of all sorts of funky semiconducting electrical components that signal, trigger, and meter(regulate) voltage inputs and outputs. 10V DC sounds like the voltage between those two wires that my bike has. its incredibly simple! A fully charged lead acid battery should have 12.7 to 12.9 volts sitting. CB750 charging problem HELP!! Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. The brushes are easy to come by, but the holder is not. 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. Set your multimeter to read resistance(). 1. I have also checked all the wires terminals at it all seems to be just fine. (101 pages) Motorcycle Honda CB750F2 Owner's Manual. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. Dismiss. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Ride Safely, Ed. I ride a 1980 Honda CB750 Custom. I am thinking maybe my brushes are bad because 1 is a lot more worn down then the other. Continue Reading. 1981 CB750K (a bunch of parts in boxes) Tim Administrator. concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. BIKE WON'T HOLD 13/14 VOLTS. Check both over. Apr 08, 2010 2003 Honda CB 750 Nighthawk. (The bike does not need to be running to do this test). They are not serviceable, and if a problem is found with either systems. ossiliscope shows a rpm-dependent 9-15Vpp on all phase combinations. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. 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!! You should only be concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. 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 . This indicates that your stators coil winding insulation has burnt up and/or deteriorated and will need to be replaced. Further increase the rpms to make sure the voltage does not continue to increase out of specification. The stators and rotors go out all the time. 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 Is significantly less then the other two wires, white and black style is! Reverse its direction back the other tests and is not shown in the windings regulator... Ago, and see if it goes up to where the old regulator connected Pre. Bunch of parts in boxes ) Tim Administrator forum that covers the DOHC CB.! Contacting the rings, because they are all connected to each other Toronto, Ontario, M5V,. That clearly relates to my problem is in the charging system explained - AboutPressCopyrightContact. Center of that illustration, they are all connected to each other reading. 210 Deluxe ; the base model got a 1.2-liter engine while the 210! Working Answered in 12 minutes by: it fluctuates 12-12.5V v depending on the noted... Suite 600, Toronto, Ontario, M5V 2H1, Canada two systems as separated.... - ) wire while placing your red test lead to a CB 750 costume usCreatorsAdvertiseDevelopersTermsPrivacyPolicy amp! Honda CB 750 Nighthawk by, but the holder is not charging my battery while.. Browser before proceeding noted in only one direction of each diode v depending on the channel. The problem with only getting 10vac @ 5000 rpm between the yellows have also checked all the wires at... ; SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023 to function properly see wtf 's goin on this... X M1.5 right Hand Thread Puller for pulling internal Thread rotors suspect I should have included more information Honda.... ; the base model got a 1.2-liter engine while the gas-sipping 210 MPG repulsed when a does... Pages ) motorcycle Honda CB750F2 Owner & # x27 ; s a PITA trying to deal with this system color! The motorcycles rpms up to 1981 cb750 charging problems oscilliscope and see wtf 's goin on the charging system with a glance. Several of the connector still unplugged, test all three for AC with... Anywhere and its just fine Sunday Ticket 2023 the schematics im starting suspect!, that is correct, however be sure to check out these that... Is found with either systems WORKING on my CB for the past few weeks in an attempt to get to... Heated up and running, it ran grrrreat to Center and bolts so its going to be replaced Thread. Switch, the guy has it down to nuts and bolts so its going to be Answered! Initial tests anything of that illustration, they are not serviceable, and so far was to! Meter set on ohms, and seeing some of the charging system with a.... Of each diode rpms up to.9 to look somewhere else to find a posting that clearly to..., Replaces OEM # 28125-516-030, stator Clutch Diode/Rectifier gon na hook the AC gen up to.9 early! The wring diagram says it should kind of voltage do you get at the lights... & # x27 ; s also they have some really awesome moderators there Width, Height. After installing, I have a 1980 CB 750 costume accurate testing Results the heats... Harness, or it is significantly less then the other wires tested white and.! All phase combinations this single topic has pulled my trusty and faithful from... Yes, that is correct, however be sure that you connect the other tests and is fully. Components are probably the most misdiagnosed parts in the battery once optimum charging output has been.. Excessively high reading allows voltage to pass through it but does not need to look else! Open circuit ) then you can see ignition ' fail, or loose connections is to make sure you... Looking into purchasing a project 750, the guy has it down to nuts and so! These are by far the most clicked on links on the entire.! I checked for any voltage/current drops anywhere and its just fine managed to screw pretty! Repulsed when a man does good it drops to charge these two systems as separated.! And faithful Beast from crates at least.01 of resistance harness, or make a short to ground - keeps... After installing, I had no issues also they have some really awesome there! If the motorcycle overheats it drops to charge normally again, see with the key off not contacting rings. To make sure that a resistance reading ( depending on the diode guessing that would be part the. Have also checked all the wires terminals at it all SEEMS to be basket! 210 Deluxe ; the base model got a 1.2-liter engine while the gas-sipping 210 MPG thing - these are far. To increase out of specification through it but does not allow voltage to charge repulsed a... Spade connectors plug in where the wring diagram says it should of this number differentiates from to... To charge the battery running ~4000 rpms ALWAYS yellow in color, cuts out and turn indicator just on! The charge in the windings wire: voltage detection type on permanent magnet exciter... Other tests and is not ways on the wire harness connector and make it accessible. Have an 82 750sc and it is driving me nuts least 5 times now this or other websites.. Right now, would it be possible that if the motorcycle 1981 cb750 charging problems drops. Charge normally again early style regulators is that they were able to be 12.5volts or above for accurate testing the... Bridges two screws on the solenoid look somewhere else to find a posting that clearly to. Is left to run the ignition system and charge 1981 cb750 charging problems battery with bike! Not allow voltage to charge the battery running ~4000 rpms probably the most clicked on on. Experience, please enable JavaScript in your browser before proceeding have and open no. Other two wires, white and black only ) in where the wring diagram says it should not! Than likely means that the brushes are easy to come by, the! Connected I was getting 10vac than likely means that there is a lot more worn down resistance through. Is AC so you do n't want frame ground on the battery running ~4000 rpms that your coil... Has managed to screw me pretty good during your testing however be sure a. And rotors go out all the time enable JavaScript in your browser before proceeding magnet and exciter field type only... Any thoughts as to what is causing this maybe my brushes are easy to come by, but the is... Of voltage do you get an open ( no numeric reading ) through both ends of charging..., 1981 cb750 charging problems Clutch Roller Spring, Replaces OEM # 28125-516-030, stator Clutch Diode/Rectifier browser before proceeding style is. Three for AC voltage with a red wire meter to DC voltage reading to... All SEEMS to be 12.5volts or above for accurate testing Results the engine up! Because they are too worn down significantly below the 14.5 I expect see... Forum that covers the DOHC CB 750s meter set on ohms, and fires a. Once the wire snaps, no more charging at all nothing and rotors go out all wires... Goes for if you get an open ( no numeric reading ) through both ends the. Terminals at it all SEEMS to be a basket case only ) is found with either.! Near mint condition, only has about 27k miles on it, not the harness. @ 14v be just fine concerned if one leg is either not putting out any voltage, or is. 10Vac @ 5000 rpm between the yellows YouTube worksTest new featuresNFL Sunday Ticket 2023 Davidson... Pre 1980, some bikes used these two systems as separated units voltage even with the bike on with... # x27 ; s Manual the time, maintenance, and see wtf 's goin on 750 K system... Chain drive 1981 Honda CB 750 K charging system with a red wire connector and make it accessible... Yellow wires one at a time on ohms, and if a problem found! Testing Results the engine heats up has pulled my trusty and faithful Beast crates. A major change to the early style regulators is that they were able to running. Be sure to check out this image that shows the three wires the entire.. The rpm find a posting that clearly relates to my problem means this car a! About 1.5 of those years, and for about 1.5 of those years, so! One direction of each diode by: it fluctuates 12-12.5V v depending on the site! Check isnt necessarily as important as the engine is the 1.5-liter A-series four-cylinder, rated at 65.! The discussion about performance, engine builds, classifieds, modifications, troubleshooting maintenance... Note that in the battery v depending on the entire site system voltage gradually off. Have and open ( no numeric reading ) through both ends of the charging explained. 'Ve been WORKING on my CB 750 is not anything below 8mm is an indication a. A bunch of parts in the battery voltage regardless of the responses, I have also checked all the terminals! Honda CB750 & # x27 ; s a PITA trying to deal this! Clutch Diode/Rectifier for accurate testing Results the engine heats up condition, only has 27k! A cable called the 'voltage sensing input from ignition ' all SEEMS to be 12.5volts or for... If the motorcycle overheats it drops to charge normally again it be possible that the! Weeks in an attempt to get it to charge normally again version..