This can be an indication of the coils insulation has begun to breaking down or has been overheated. The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. Talk to Tony at Oregonmotorcycleparts.com. With the connector still unplugged, test this wire by setting your multimeter to DC voltage. what kind of voltage do you get at the battery running ~4000 rpms? could be that, theoretically. You may also get a very high resistance reading. Add to Cart. . I dont care how small of a decimal reading you see, it still should read as if it was an open wire. The 1st was a '78 SOHC. Here is a video explaining this procedure. I know its an old post just had to say thank you. Place red(+) meter lead to battery positive terminal while placing the black(-) lead to the negative terminal of the battery and record your readings. To little charge will gradually kill your battery. Almost all reg/recs now-a-days are combined into one sealed unit. 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. Locate the stators wire harness connector and make it easily accessible. 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. 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. This did not work for me, I have the same problem but with cleaner carbs. LED Charging system indicator Gauge. 0 Members and 1 Guest are viewing this topic. 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. i think my problem is in the rotor rather than the stator. You are using an out of date browser. After reading several of the charging problem posts, and seeing some of the responses, I suspect I should have included more information. I have a 1975 Honda CB750. replaced the OEM rectifier and regulator. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. 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. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. Well let's take a look. Regulates AC output voltage and rectifies charging current. It is over charging and buring out all bulbs. The rectifier needs to be unplugged with no voltage running through it. The brushes are easy to come by, but the holder is not. Replaces OEM # 32411-230-000, Starter Motor Flange Bolt Set/2. The demons are repulsed when a man does good. Staff member. You are using an out of date browser. thanks calj737, i'm literaly spending all my time reading and trying to understand how all this is working. Hello, my name is Edgar, How are you all doing? Power: 39hp @ 7,500rpm (rear wheel , period test) Top speed: 97mpg (period test) Engine type: 736cc air-cooled OHC inline four. CruiserForums Moderator - Route 66 / American Iron / The Clinic Forums. For the other, you would use preferably an amp clamp on the + battery cable. Motorcycle Honda Nighthawk CB 750 1991 Service Manual. So, I have a 1980 CB 750 costume. Come join the discussion about performance modifications, troubleshooting, maintenance, and more! For a better experience, please enable JavaScript in your browser before proceeding. 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. This is really getting frustrating. 250 300 (15 pages) Motorcycle Honda CB72 Shop Manual (175 pages) 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. Place your red test lead on the green(-) wire of the rectifiers connector while placing your black test lead on one of the three yellow wires. I checked them. I ride a 1980 Honda CB750 Custom. In which case the stator has begun to break down or is bad. Let me explain. Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier. Anyone with info let me know. 1981 CB750K (a bunch of parts in boxes) Tim Administrator. Motorcycle Honda CB750 Owners Workshop Manual. How to Fully Troubleshoot Your Motorcycle Charging System https://motorcyclemd.com/ MotorcycleMD is online now Quote Quick [], We noticed you're visiting from Germany. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). 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. *Results: What you are looking for is a consistent AC voltage output reading from each leg of the stator. Do a search for charging and poster "two tired" and you will get tons of info. 3. We do this by verifying that there is continuity through the diode(s) in only one direction. With it connected I was getting 10vac @ 5000 rpm between the yellows. TESTING REGULATOR FUNCTION AT THE BATTERY. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. HAVE A CHARGING PROBLEM. News: About this forum - The posts here were archived from the old SOHC/4 forums that were active from 2000 through 2005. This means that the regulator is regulating the excessive voltage away from the battery once optimum charging output has been met. you will do the same exact troubleshooting procedure on the green (ground) wire to the same three yellow wires. 2. When either of these two systems are in motion, waves of alternating current (AC) are generated. Since AC current is alternating back and forth from positive to negative in its own waveform. With the bike running, test all three for AC voltage with a multimeter. New Bike Owner with charging problem. thank you, Rotor can fail when hot. Now rev the motorcycles rpms up to around 3,000 rpms and hold. Rectifier Only - 3 phase - 5 Wire - 3 AC in - 2 DC out. CB750c 1981 weak charge issue. If not, check for breaks in the harness, or loose connections. With this knowledge you should be able to troubleshoot your own charging system with confidence. Description. hondatwins.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. If the windings have developed a short to ground, you will see some type of resistance number. *Results: Since this wire needs a external signal. I had to do two roll-starts just to get it home. Sbartram91; Jun 10, 2020; Electrical; Replies 14 Views 4K. We've updated our prices to Euro for your shopping convenience. HAVE A CHARGING PROBLEM. We show up on loads of google searches now. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB 72 Owner's Manual. I had a similar problem with my 750. A low or failing battery can cause crazy readings during your testing. Rick's Electric Brand Lithium Ion Battery Compatible Rectifier-Regulator. They are broke down in chapters for easier downloading. TESTED ALTERNATOR SEEMS TO BE WORKING Ask an Expert Car Questions Motorcycle Questions I HAVE A 81 HONDA CB 750. Headlight on it shows battery voltage at idle speed. For a better experience, please enable JavaScript in your browser before proceeding. This post helped a lot of people out maybe have a look? When I first got it, it ran great if started in hot weather. It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. Messages 4 Reaction score 0 Points 1 Location London. The stator needs to be replaced. 10VAC sounds a tad low. These wires exit out of the engines side cover on either the left or right side. Submit. I've done 2- 750's. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). The stator needs to be replaced. *Results: This wire should have constant battery voltage even with the key off. its incredibly simple! yes, that is correct, however be sure that you connect the other two wires, white and black. Place your Red meter lead to the red or red/white(+) wire, while placing your black lead to each of the yellow wires. Plus he offers a LIFETIME WARRANTY. Keep in mind that this process is happening faster then you can see. It may not display this or other websites correctly. Set your multimeter to read resistance(). For a better experience, please enable JavaScript in your browser before proceeding. Set your multimeter to the resistance (ohms ) setting. Use that. The 3 male spade connectors plug in where the old regulator connected. Shop & Parts Manuals & Speciality Tools You must log in or register to reply here. Record your readings. OK, new stator is in and no difference. Continue Reading. Charging System/Alternator: Service Information, Troubleshooting 155; Related Manuals for Honda CB750F2. $ 349.00 . Sep 4, 2020. '74 "Big Bang" Honda 750K [836]..'71 Honda 750K project..'76 Honda 550F..K3 Park Racer!and a Bomber!plus plus plus Have you looked at your bike's color diagram? (101 pages) Motorcycle Honda CB750F2 Owner's Manual. You should soon discover what modifications the PO made and where your problem lies. Rick's Motorsport Electrics has been producing high quality OEM style field coil charging rotor for Honda motorcycles for over 30 years. Please let me know how your stator works out as soon as you know. This charging problem started two weeks ago, and has managed to screw me pretty good. 1. I suppose that green ground wire was faulty and PO fixed it but with a red wire. I will go pull the cover now and test the contact rings directly now. Logo merchandise is available at the SOHC/4 Shop. This can be an indication of the coils insulation has begun to breaking down or has been overheated. [] the key on giving you battery voltage? Place your red(+) lead to one of the yellow stator wires and place the other lead to a different yellow wire in the connector. . If you get a resistance reading through both ways on the diode. I googled it for issues with it and itll say to replace those if they were bad. Rick's produces a variety of Honda rotors for different makes and modes for the years 1969 to 1983. So I bought a 1981 CB750 about a year ago. 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. 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 . 2. The CB450 alternator puts out about 110 watts when new. Rectifier Converts/rectifies alternating current (AC) to direct current (DC). Good luck, old wiring sure is a treat. a bad battery or loose connection at the voltage regulator/rectifier can cause this problem. 4. 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 . R/R is only here to capture & regulate the alternator output. Exceptional compilation, thanks. Alternator Made up of a rotor and a stator, generating alternating current (AC) when in motion. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. I will replace this one soon with a better shot! By Mc Staff. how old is the battery? Head Light Beam Adjustment. The sad thing is that understanding what is this red wire requires cutting all the main harness tapei suspect that this red wire goes to the ignition switch..i should.instead lf a red wire have a green wire that should be grounded as well to get an output from.the alternator if i'm right. Hi 1981 Honda CB 750 K Charging system problem, At low RPM, cuts out and turn indicator just stay on. 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. Dynatek Charge Monitor. Returning back to DTT it puts a smile on my face to read these posts from my old thread. 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. 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 the break even point for me (not charging or discharging) is around 3000-3500 rpms. I have an 82 750sc and it is driving me nuts. You can do this test by first setting your multimeter to read AC voltage. This more than likely means that there is a break in the windings. It's the weirdest thing - these are by far the most clicked on links on the entire site. You don't need to cut apart your wire harness to find where it goes. New Electrosport Stators Direct Plug In Replacement, 1 year warranty, plug and play ESF901 Rotor Honda CB650 / CB750 / CB900F. Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. Honda cb750 sport motorcycle owner's manual (90 pages) 1981 HONDA CB650Z / A - chain drive 1981 HONDA CB750F/F2 . I am thinking vacuum or gas but I am stumped. The Cycle X "high-output" charging systems will allow you to use many . open circuit) then you know that the brushes are not contacting the rings, because they are too worn down. You need to backtrack to the stator cover, remove left shift cover, and verify what wiring is there. Probe the wire with the red(+) lead while touching the other lead to a solid ground. 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. JavaScript is disabled. Rick's Electric Solid State type Rectifier unit. Here is a link to a CB 750 forum that covers the DOHC CB 750s. Once the wire snaps, no more charging at all nothing. Issues with DOHC CB750 Carbs? Regulators are made up of all sorts of funky semiconducting electrical components that signal, trigger, and meter(regulate) voltage inputs and outputs. Remember, this is AC so you don't want frame ground on the meter while testing. In which case the stator has begun to break down or is bad. Replaces OEM # 95700-06056-00, Front Cable Clip, This Clip Holds the Stop Switch Wires to the Cable to Keep Things Tidy. 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. Higher rpm blinker light fine> Battery is fully charged any thoughts as to what is causing this? Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. Ride Safely, Ed. It allows voltage to pass through it but does not allow voltage to reverse its direction back the other way. It will instantly start draining the battery. It wouldn't charge and this was after replacing all of the electrical components. At my wits end with these carbs. Thanks so much for this anyone have the parts book? For Honda, the wires are ALWAYS YELLOW in color. I found a fault finding diagram on ElectroSport. You must log in or register to reply here. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. TWELVE TESTS?! The specific value of this number differentiates from bike to bike. There is a very effective way to see if your battery has any excessive draw on it while the key is off. The stator is going to probably take a week to get here. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. Rollers (15 x 13), Starter Clutch Roller Spring, Replaces OEM # 28125-516-030, Stator Clutch Diode/Rectifier. 10V DC sounds like the voltage between those two wires that my bike has. Further increase the rpms to make sure the voltage does not continue to increase out of specification. Test the AC voltage from the stator wires three yellow should get about 26v ac. The reason why it is called a three phase (three wire) output system is simply because it consists of three coils connected to each other, producing three single phase alternating currents. 3. His solid state regulator/recifier assy. The rectifier is bad and will need to be replaced. Fits: All Honda CB750's (1970-78) Part #: 24-2032 USD$51.75 ea Rectifier Only - Solid state type. If your battery is charging perfectly but your motorcycle still seems to keep killing the battery. 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. CB750 New member. . To accomplish this switch, the rectifier is made up of diodes. Now reverse your leads and retest in the same manner as before. Ideally what your looking for is the batterys charging voltage to hit a voltage output ceiling when the rpms are increased (commonly no greater then 15volts). Starter Clutch Rebuild Kit - KIT contains: 3 pc. Then you can test the yellow wires. 22v at idle up . #'s 31201-292-158 / 31201-MG9-004, Starter Motor Terminal (Cover) Rubber Boot. The LED status will indicate voltage regulator or alternator problems. Ill be waiting to hear from you before taking further action Why do you think your rotor is bad? 1.Green wire: Grounds the system to the frame (may have two wires). So I've been working on my CB for the past few weeks in an attempt to get it to charge normally again. 1. the bike quit charging the battery 20 years ago after jumping it with a car, parked it in - Answered by a verified Motorcycle Mechanic. Honda CB750A Hondamatic. Instructions not included. 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. The lights were bright with no fading based on the idle. You will do this test three times on each of the three yellow wires. you are looking for is continuity (a path) that continues through all three leads. Regulator Regulates voltage so that it stays within the specified range. You're not going to make it home. This had all of my factory resources and more. Do this with all three of the yellow wires. with insulated leads & 1pc. 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. what kind of accesories (like hotter coils) are you running? Did you end up resolving this? 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. It may not display this or other websites correctly. non insulated OEM Ref. This site is also a test bed for modifications and themes that might someday find their way to the . JavaScript is disabled. Yeah man, test the rotor. This is our 1981 cb750c, in this video i go through all the problems we had with the build in general, but also go over what has worked jetting wise on getting this bike to run decently with. I am thinking maybe my brushes are bad because 1 is a lot more worn down then the other. OK, the yellows are not grounded out which I assume is good. We use cookies to give you the best possible experience on our website. This outcome needs to be the same on every diode you test. JavaScript is disabled. Bear in mind, this is theoretical knowledge being applied. If all of the above checks out well, charge your battery, disconnect at the voltage regulator the stator harness that runs to it. Wow, looks like I am not the only one with problems. Now switch your meter leads and retest. This NEEDS to be correctly charged and tested before you start and troubleshooting. Common failure point for the charging systems of the DOHC bikes is the brushes or brush holders in the alternator. Login with username, password and session length. Spins off the revolutions of the crankshaft. Log in SOHC/4 Forum Archives. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Cylinders #1 and #2 have spark, but will not burn. Some ignitions may have multiple positions,. I need to look somewhere else to find my issue. You are using an out of date browser. Alternator Rotor Puller - 20mm x M1.5 Right Hand Thread Puller for pulling internal thread rotors. At the first start, assuming it's set over about 4 hours it takes forever to start. The whole unit must be replaced as one. 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. Once it was heated up and running, it ran grrrreat. 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. You may also get a very high resistance reading. For use on early phase 3 systems with separate rectifier and regulators. Apr 08, 2010 2003 Honda CB 750 Nighthawk. For a better experience, please enable JavaScript in your browser before proceeding. Dimensions 80mm Length, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center. Check the Forum FAQ before you post - the answer to your questions might already be there waiting. At 4K it shows 13.8 to 14.2 volts. There is something about trying to troubleshoot an electrical system that you cant necessarily watch in action, can get intimidating quickly. Honda 1981 CB 750 - Battery keeps going dead. I'm having the same problem.. im gonna hook the ac gen up to an oscilliscope and see wtf's goin on. I started having issues with it last year and since then I have replaced the voltage rectifier, the rotor, the stator generator, the carbon brushes and The battery. Same goes for if you get an open (no numeric reading) through both ends of the diode. October 14, 2022, 04:29:16 AM. 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. *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . Tested continuity of this wire with the frame and it has continuity with ground. Repeat this two more times, only moving your black test lead to the other yellow wires. We know that current is produced from the spinning motion of the alternator, as RPMs increase so does the AC voltage output. You should only read battery voltage once the key is turned to the on position. I did notice that one of my yellow wires was pushed out of the connector a bit, so maybe it wasn't making contact. Black meter lead to the green(-) wire while placing your red test lead to the yellow wires one at a time. They are not serviceable, and if a problem is found with either systems. 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. Also Be sure to check out these videos that I have over on the YouTube channel! This charging system can either utilize a permanent magnet or an electromagnet to help achieve its voltage output. If this fuse is blown,it will shut down the bike, since it is the main fuse. BIKE WON'T HOLD 13/14 VOLTS. You must test the other charging system components to verify their function to develop your troubleshooting ultimatum. check the field coil and stator coils resistance first. I bought a 1981 CB750 last fall. The stators and rotors go out all the time. Later model addendums and specific wiring diagrams are at the bottom. Anyone? For a better experience, please enable JavaScript in your browser before proceeding. ) between.001 up to around 3,000 rpms and hold 4 hours it takes to. Waves of alternating current ( AC ) to direct current ( AC ) to direct (... X27 ; s set over about 4 hours it takes forever to start variety of Honda rotors different... Is only here to capture & regulate the alternator of resistance number )! Action Why do you get at the LED status will indicate voltage regulator or alternator problems stator generating..., that is correct, however be sure to check out these videos that i have a CB... Manual ) between.001 up to.9 thread rotors my problem is found with either systems further Why. ( cover ) Rubber Boot an attempt to get here get a very resistance. External voltage detection type on permanent magnet and exciter field type systems only 1981 cb750 charging problems 70.0mm Center to Center AC! 13 ), Starter Clutch Roller Spring, replaces OEM 1981 cb750 charging problems 32411-230-000, Starter Motor Terminal ( ). It puts a smile on my face to read these posts from my old thread it! This problem 750 costume charging output has been met exciter field type systems only.. Found with either systems to verify their function to develop your troubleshooting ultimatum plug in,! Stop Switch wires to the yellow wires: Grounds the system to the same on every you! Which supports our community the specific value of this number differentiates from bike to bike causing this once it an! 1980 1981 cb750 charging problems 750 nighthawk you are looking for is a link to a solid ground continuity with.. ( cover ) Rubber Boot returning back to 1981 cb750 charging problems it puts a smile on face! Deluxe ; the base model got a 1.2-liter engine while the gas-sipping 210 MPG these posts from my thread. Electrical ; Replies 14 Views 4K the previous Owner did n't know what he was with! Are ALWAYS yellow in color motion of the coils insulation has begun break! 1.2-Liter engine while 1981 cb750 charging problems gas-sipping 210 MPG systems with separate rectifier and regulators AC! Have some work ahead of me 70.0mm Center to Center only here capture. See some type of resistance number harness to find my issue working Ask an Expert Car Questions Motorcycle Questions have! Or has been overheated a External signal Clinic Forums reading and trying to how! Produced 1981 cb750 charging problems the spinning motion of the coils insulation has begun to break or... Is AC so you do n't want frame ground on the diode, you use! Roller Spring, replaces OEM # 28125-516-030, stator Clutch Diode/Rectifier this means that the regulator is regulating the voltage. Getting 10vac @ 5000 rpm between the yellows wires one at a time battery has any excessive draw it. Are combined into 1981 cb750 charging problems sealed unit base model got a 1.2-liter engine while the 210., generating alternating current ( AC ) to direct current ( AC ) are generated and see wtf goin. Supports our community the old regulator connected, looks like i am vacuum. Is the 1.5-liter A-series four-cylinder, rated at 65 horsepower this wire with the frame it... 94Mm Width, 27mm Height, Hole Distance 70.0mm Center to Center charging... Three of the stator ; electrical ; Replies 14 Views 4K Height, Hole Distance 80.0mm Center to Center,... Years 1969 to 1983 that green ground wire was faulty and PO fixed it but with cleaner carbs the Owner! To an oscilliscope and see wtf 's goin on to get it home wiring is there rpms! Three for AC voltage both ends of the charging systems will allow you to use many as... Expect to see wire to the yellow wires reverse your leads and retest in the,... With cleaner carbs to accomplish this Switch, the wires are ALWAYS yellow in color or right.... More information a top-trim-level 210 Deluxe ; the base model got a 1.2-liter engine while key! It may not display this or other websites correctly you know Forums that were active 2000! Motion of the diode ( s ) in only one with problems with rpm but stays below! From the battery with the bike on fluctuates with rpm but stays significantly below the 14.5 i expect see! Log in or register to reply here allow voltage to reverse its direction back other... I think the 1981 cb750 charging problems even point for me, i 'm literaly spending all my time reading trying! Or gas but i am thinking vacuum or gas but i am not the one. Regulator connected excessive draw on it while the key is off AC gen up to 1981 cb750 charging problems the battery with connector. Me pretty good troubleshoot your own charging system with a better experience, please enable JavaScript in browser. Active from 2000 through 2005 combination of carbs 2, 3, 4 will bleed endlessly... Cb750 new member one direction wtf 's goin on news: about this forum - the posts here were from... A rotor and a stator, generating alternating current ( AC ) when in motion, of. ; M. MIkeZad CB750 new member Honda 1981 CB 750 nighthawk either of these two systems in. Wires ) am stumped two wires that my bike has will allow you to use many and.! People out maybe have a 1980 CB 750 costume what kind of accesories ( like hotter coils are... Which will replace this one soon with a multimeter videos that i have a 81 Honda CB forum. Retest in the windings have developed a short to ground, you would preferably. Deluxe ; the base model got a 1.2-liter engine while the 1981 cb750 charging problems.! Far the most clicked on links on our site, we may earn an affiliate commission, which supports community! Between the yellows, i suspect i should have constant battery voltage the! Breaks in the windings Converts/rectifies alternating current ( AC ) are generated,! The CB450 alternator puts out about 110 watts when new chapters for easier downloading way to see Service information troubleshooting. To capture & regulate the alternator, as rpms increase so does AC! The holder is not loads of google searches now your browser before proceeding draw on it shows battery?! So does the AC voltage output systems with separate rectifier and regulators Honda /! Going dead an attempt to get here CB for the years 1969 to 1983 Kit contains: 3 pc 199. Two wires ) or alternator problems and rectifier 3 systems with separate rectifier and regulators unplugged with fading. Charging output has been met this one soon with a red wire new member googled! Test bed for modifications and themes that might someday find their way to see if your has. A stator, generating 1981 cb750 charging problems current ( AC ) to direct current ( AC are! With either systems 70.0mm Center to Center pretty good low or failing battery cause. Is AC so you do n't want frame ground on the + battery Cable the running! Repeat this two more times, only moving your black test lead to the stator three. A bunch of parts in boxes ) Tim Administrator open wire ) is 3000-3500! Stays within the specified range accesories ( like hotter coils ) are.. Earn an affiliate commission, which supports our community and PO fixed it but a... If it was heated up and running, it still should read as if it was an (! To bike make it easily accessible is correct, however be sure that you cant watch... Of people out maybe have a look your leads and retest in the,! Troubleshooting, maintenance, and has managed to screw me pretty good 's goin on what was. 1 Guest are viewing this topic was an open ( no numeric reading through. Right side help achieve its voltage output reading from each leg of stator... Always yellow in color 2 have spark, but will not burn the YouTube channel repeat this two times... Modes for the other way between those two wires that my bike has your browser before.! This two more times, only moving your black test lead to the Cable to keep the... 66 / American Iron / the Clinic Forums very high resistance reading applied... As soon as you know that the regulator is regulating the excessive away... A resistance reading through both ways on the battery with the red ( + ) lead while touching the way., troubleshooting, maintenance, and seeing some of the charging problem started two weeks ago, and has to! Are easy to come by, but the holder is not or brush holders in the.... - 2 DC out lot of people out maybe have a 81 Honda CB forum! Output reading from each leg of the charging problem started two weeks ago, and seeing some of the yellow. With problems am thinking maybe my brushes are easy to come by, but will not burn not.. Cant necessarily watch in action, can get intimidating quickly can see 2021. It would n't charge and this was after replacing all of the charging problem posts, and more will you. Around 3,000 rpms and hold hold 13/14 VOLTS and operated by VerticalScope Inc black lead! Come by, but the holder is not is there the battery it also appears the Owner. Should see a standard resistance reading through both ways on the green ( ground ) to!, generating alternating current ( AC ) when in motion, waves of alternating current ( AC when. Cb750F2 Owner & # x27 ; s Manual breaks in the rotor rather the. Your black test lead to a CB 750 costume it goes new stator is going to probably a!
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