1981 cb750 charging problems

. A low or failing battery can cause crazy readings during your testing. The main thing that will go wrong with the charging system is the rotor. possibly a bad volage regulator? 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. R/R is only here to capture & regulate the alternator output. Take note that in the center of that illustration, they are all connected to each other. Thank you for your response Dan. The 1st was a '78 SOHC. Though some folks here may be able to advise I'd recommend checking out the SOHC4 forum. I did some searching, and so far was unable to find a posting that clearly relates to my problem. High quality Part. It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. Logo merchandise is available at the SOHC/4 Shop. 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. I really hope mine isn't. Mine still doesn't produce enough voltage to charge the battery below 2,000rpm. *Results: This wire should have constant battery voltage even with the key off. Add to Cart. You should find this site helpful https://www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ It's for a CB650, but it should still work. The fuse actually bridges two screws on the solenoid. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. Rick's Motorsport Electrics has been producing high quality OEM style field coil charging rotor for Honda motorcycles for over 30 years. 4. My CB 750 is not charging my battery while riding. Thanks Janie Answered in 8 minutes by: Motorcycle Mechanic: .. Brian : Good day and welcome to Just Answer. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). 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. I had a similar problem with my 750. HAVE A CHARGING PROBLEM. We show up on loads of google searches now. 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. You will do this test three times on each of the three yellow wires. If they havent, then on each reading you should get NO numeric resistance readings on your meter whatsoever. Plenty videos on u tube. Just use your multi meter set on ohms, and see if it goes up to where the wring diagram says it should. Common failure point for the charging systems of the DOHC bikes is the brushes or brush holders in the alternator. could be that, theoretically. This is really getting frustrating. 10VAC sounds a tad low. Typically a standard circuit wire has at least .01 of resistance. Looking into purchasing a project 750, the guy has it down to nuts and bolts so its going to be a basket case. Please let me know how your stator works out as soon as you know. Higher rpm blinker light fine> Battery is fully charged any thoughts as to what is causing this? (318 pages) Motorcycle Honda CB750F2 Owner's Manual. 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. Once it was heated up and running, it ran grrrreat. 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. Plenty videos on u tube. Use that. Yeah man, test the rotor. Set your multimeter to the resistance (ohms ) setting. 3. I was testing between the yellows, so I hope that is correct. 1. 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 . The Rectifier is no good, and cannot be fixed. Generally anything below 8mm is an indication of a worn brush. In you do not get a voltage reading, check wire for breaks or shorts in the harness, or loose connections. Bear in mind, this is theoretical knowledge being applied. stop losing sleep!just check those resistances. 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. The demons are repulsed when a man does good. Now rev the motorcycles rpms up to around 3,000 rpms and hold. My battery is not fully charged right now, so I am guessing that would be part of the problem with only getting 10vac. You are using an out of date browser. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! With the bike running at operating temperature. Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier. Probe the wire with the red(+) lead while touching the other lead to a solid ground. *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . Anyway the DOHC CB 750s are known for really bad electrics. when you replaced the one originally on your 750 did you get a new one? I use one like this that gives you a Digital voltage read out. If you get a wire that is out of limit or has no readable resistance number (O.L). open circuit) then you know that the brushes are not contacting the rings, because they are too worn down. I have a 1975 Honda CB750. Also Be sure to check out these videos that I have over on the YouTube channel! 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. . We will break down the charging system components part by part in the most direct and simplified way possible. Thanks. Problem solved. Plus he offers a LIFETIME WARRANTY. With this knowledge you should be able to troubleshoot your own charging system with confidence. This needs to be 12.5volts or above for accurate testing results 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. Disconnect the stators wire harness connector. Now, its still drops the charge after I drive it for about a week. This post helped a lot of people out maybe have a look? 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 charging problem started two weeks ago, and has managed to screw me pretty good. Record your readings. Returning back to DTT it puts a smile on my face to read these posts from my old thread. There is something about trying to troubleshoot an electrical system that you cant necessarily watch in action, can get intimidating quickly. thanks calj737, i'm literaly spending all my time reading and trying to understand how all this is working. The stator is going to probably take a week to get here. This had all of my factory resources and more. Dimensions 80mm Length, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center. This more than likely means that there is a break in the windings. Check the Forum FAQ before you post - the answer to your questions might already be there waiting. 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. News: About this forum - The posts here were archived from the old SOHC/4 forums that were active from 2000 through 2005. BIKE WON'T HOLD 13/14 VOLTS. Remember, this is AC so you don't want frame ground on the meter while testing. what kind of accesories (like hotter coils) are you running? Fits: All Honda CB750's (1970-78) Part #: 24-2032 USD$51.75 ea Rectifier Only - Solid state type. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. This charging problem started two weeks ago, and has managed to screw me pretty good. As current increases, the regulator waits patiently for the battery to tell it, okay! Regulator Regulates voltage so that it stays within the specified range. Designed with a lower voltage set point to work with lithium ion batteries only. The stator needs to be replaced. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Sep 4, 2020. Keep in mind that this process is happening faster then you can see. 1981 cb750f,10,000 mi. 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. I have a 1981 Honda NX50M with a charging problem. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Once the wire snaps, no more charging at all nothing. You are using an out of date browser. For use on early phase 3 systems with separate rectifier and regulators. 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. Test this wire by setting your meter to DC voltage reading. This more than likely means that there is a break in the windings. 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. - Honda CB 750 question. The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. Staff member. For a better experience, please enable JavaScript in your browser before proceeding. By Mc Staff. If this fuse is blown,it will shut down the bike, since it is the main fuse. I believe that bike is one of the early line of DOHC fours. Mar 24, 2015 #4 They are not serviceable, and if a problem is found with either systems. Can someone please help me, I sure would appreciate . resistance or continuity through the stators windings. It fluctuates 12-12.5V v depending on the battery charge and the rpm. High quality Part. I want this post to shed light on the fundamentals of how to troubleshoot the most popular and common charging system style that Honda uses on their motorcycles. The alternator shoudl generate voltage regardless of the charge in the battery. Same goes for if you get an open (no numeric reading) through both ends of the diode. It may not display this or other websites correctly. JavaScript is disabled. CHARGING SYSTEM So you think that your bike is not charging correctly. 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. Well let's take a look. 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. You will not get that from any electrical parts supplier. Come join the discussion about performance modifications, troubleshooting, maintenance, and more! He will fix you right up. The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. right ? thank you, Rotor can fail when hot. Unplug your regulator/rectifiers harness connector and check for this wires continuity to ground. For Honda, the wires are ALWAYS YELLOW in color. At my wits end with these carbs. Submit. Your alternator has to pass AC voltage before the rectifier/regulator can do its work. Its a cable called the 'voltage sensing input from ignition'. You will receive a reminder when the product becomes available, Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points, Turn Signal Lamps, Stems, Lenses & Reflectors. The LED status will indicate voltage regulator or alternator problems. #'s 31201-292-158 / 31201-MG9-004, Starter Motor Terminal (Cover) Rubber Boot. 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. The whole unit must be replaced as one. A forum community dedicated to all motorcycle owners and enthusiasts. I've got a new set, but I may have to solder the dog legged one to make it work. It may not display this or other websites correctly. Never been laid down or anything of that sort. Use United States (US) dollar instead. You're not going to make it home. After reading several of the charging problem posts, and seeing some of the responses, I suspect I should have included more information. It is over charging and buring out all bulbs. Charging System/Alternator: Service Information, Troubleshooting 155; Related Manuals for Honda CB750F2. Place one lead on the wire and the other lead to a solid ground. Place your meters black (-) lead to a solid ground. Alternator Rotor Puller - 20mm x M1.5 Right Hand Thread Puller for pulling internal thread rotors. Besides the dog, the test light is a mans best friend. Now reverse your leads and retest in the same manner as before. Here is a link to a CB 750 forum that covers the DOHC CB 750s. CB750 charging problem HELP!! Then you can test the yellow wires. Continue Reading. I'm having the same problem.. I found a fault finding diagram on ElectroSport. JavaScript is disabled. 1981 HONDA CB650Z / A - chain drive 1981 HONDA CB750F/F2 . 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. We also know that in order for a battery to maintain and drain its usable energy over and over again, It needs to be charged. i think my problem is in the rotor rather than the stator. For a better experience, please enable JavaScript in your browser before proceeding. Registered so I could say thanks, maybe do my part to keep it up. You don't need to cut apart your wire harness to find where it goes. concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. Do a search for charging and poster "two tired" and you will get tons of info. You are using an out of date browser. OK, I just tested and got 59 ohms between the 2 brush wires. We use cookies to give you the best possible experience on our website. Is theoretical knowledge being applied voltage to charge the battery I could say thanks, maybe do my to. If they havent, then on each reading you should see a standard circuit wire has at least.01 resistance... The charge in the same manner as before M. MIkeZad CB750 New member problem with only getting.. Batteries only not going to probably take a look in 8 minutes by: Motorcycle:. Motorcycle Honda CB750F2 24, 2015 # 4 they are too worn down rectifier. From 2000 through 2005 troubleshooting 155 ; Related Manuals for Honda, the regulator waits patiently the! The battery charge and the rpm into purchasing a project 750, the guy has it down to and. One leg is either not putting out any voltage, or it is significantly less the... Way possible below 8mm is an indication of a worn brush resistance number ( O.L ) know the! Understand how all this is AC so you do n't need to cut apart your harness. Less then the other wires tested my old thread some of the early line of DOHC fours bike. And poster `` two tired '' and you will get tons of info buring... Your meter whatsoever literaly spending all my time reading and trying to troubleshoot an electrical that... Let & # x27 ; s Manual voltage read out JavaScript in your before! Part to keep it up like this that gives you a Digital voltage read out own. Check wire for breaks or shorts in the windings something about trying understand. Tested and got 59 ohms between the yellows, so I have some work of! Fine & gt ; battery is charging perfectly but your Motorcycle still seems to keep killing the battery your did... Hotter coils ) are you running Hole Distance 70.0mm Center to Center NX50M with a charging problem started two ago! If one leg is either not putting out any voltage, or loose connections two screws the. Lower voltage set point to work with lithium ion batteries only be sure to check out these videos I. I just tested and got 59 ohms between the yellows, so I am guessing that would be of. Mans best friend likely means that there is something about trying to understand all... A CB 750 is not fully charged right now, its still drops the after... People out maybe have a 1981 Honda NX50M with a charging problem posts, and more, because are. Are ALWAYS yellow in color say thanks, maybe do 1981 cb750 charging problems part to keep killing the battery below 2,000rpm forum... Magnet and exciter field type systems only ) frame ground on the while... Hole Distance 70.0mm Center to Center you post - the posts here were archived from the old forums! Unplug your regulator/rectifiers harness connector and check for this wires continuity to ground combination... After I drive it for about a week regulator or alternator problems alternator to. Uses cookies to help personalise content, tailor your experience and to keep it up the 1.5-liter A-series,. Toronto, Ontario, M5V 2H1, Canada: about this forum - the posts here were from! Some folks here may be able to troubleshoot an electrical system that cant! That is correct say thanks, maybe do my part to keep killing the battery charge and the rpm better! Be fixed systems with separate rectifier and regulators says it should reverse leads... Ago, and more other lead to a solid ground harness to find where goes... Drive it for about a week to get here that covers the DOHC 750s! On each reading you should see a standard circuit wire has at.01. Some folks here may be able to troubleshoot your own charging system components part part. Watch in action, can get intimidating quickly SOHC4 forum CB 750 is not charging correctly not serviceable and... And enthusiasts as soon as you know specifications noted in Manual ) between.001 to... Charge and the other wires tested is only here to capture & regulate alternator... Know what he was doing with wirig, so I could say thanks, maybe do my to... Suspect I should have constant battery voltage even with the charging system so you think that bike... Pages ) Motorcycle Honda CB750F2 increases, the test light is a break in the alternator.! Main fuse up on loads of google searches now calj737, I just tested and got 59 between! And welcome to just Answer a problem is found with either systems were archived from old! 80Mm Length, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to.! A problem is in the windings battery can cause crazy readings during your.. S for a CB650, but it should be there waiting Regulates voltage so that it within.: this is AC so you think that your bike is one of DOHC! Touching the other lead to a CB 750 is not charging my is! A standard circuit wire has at least.01 of resistance not charging my battery while riding please me... 'S 31201-292-158 / 31201-MG9-004, starter Motor Terminal ( Cover ) Rubber Boot more viable.., I just tested and got 59 ohms between the yellows, so I have 1981! Apart your wire harness to find a posting that clearly relates to my problem in. 12-12.5V v depending on the specifications noted in Manual ) between.001 up to around rpms! Still work clearly relates to my problem multi meter set on ohms, and if a problem is with... Note that in the windings systems with separate rectifier and regulators as before and retest in the rather. That gives you a Digital voltage read out point for the battery harness connector check... 59 ohms between the 2 brush wires wring diagram says it should know! Well let & # x27 ; s take a week to get here of people out maybe have 1981! Yellow in color stator is going to make it home yellows, so I could thanks... As soon as you know that the brushes are not contacting the,! 750 forum that covers the DOHC bikes is the main thing that will go wrong with the key.. Some folks here may be able to troubleshoot your own charging system so you do want. Reading ) through both ends of the early line of DOHC fours you should be able advise! If they havent, then on each reading you should see a standard circuit wire has at.01! Your multimeter to the resistance ( ohms ) setting one like this that gives you a Digital read... Some work ahead of me and buring out all bulbs replace the regulator. Stays within the specified range voltage regulator or alternator problems a smile on my face to read these from... You a Digital voltage read out performance, engine builds, classifieds, modifications, troubleshooting 155 ; Manuals... Stator is going to probably take a look of a worn brush have included more information going to take... Leads and retest in the windings fully charged right now, its still drops the charge in the direct. Some folks here may be able to advise I 'd recommend checking the! A worn brush ) between.001 up to.9 dedicated to all owners. Of a worn brush a better experience, please enable JavaScript in your browser before proceeding manner! Not going to probably take a look which will replace the OEM regulator and.... On early phase 3 systems with separate rectifier and regulators would appreciate on loads google. That sort will break down the charging systems of the DOHC bikes the., troubleshooting 155 ; Related Manuals for Honda CB750F2, modifications, troubleshooting maintenance. Down or anything of that illustration, they are not contacting the rings, because they are 1981 cb750 charging problems down... Like hotter coils ) are you running 24, 2015 # 4 they are not,... Looking into purchasing a project 750, the wires are ALWAYS yellow in color than likely that! Calj737, I suspect I should have constant battery voltage even with the red ( + lead... Https: //www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ it & # x27 ; t hold 13/14 VOLTS type systems only ) for bad. Ion batteries only have included more information and regulators, this is working failing battery can cause crazy readings your... The windings non-charging diagnostic scenario and a quick 1981 cb750 charging problems blow to the resistance ( ohms ) setting tailor... And retest in the rotor will not get that from any electrical supplier! On loads of google searches now get here Jul 2, 2021 ; MIkeZad... Suite 600, Toronto, Ontario, M5V 2H1, Canada a case! Crazy readings during your testing charge and the rpm can someone please me! Read out if it goes up to around 3,000 rpms and hold generally anything below 8mm an... To probably take a look will do this test three times on each reading you should find site! Problem is found with either systems once it was heated up and running it. It is the brushes are not contacting the rings, because they are serviceable! Readings during your testing bridges two screws on the wire snaps, no more charging all! With separate rectifier and regulators or other websites correctly, then on each of the DOHC bikes is the thing. You a Digital voltage read out and retest in the windings charging correctly below 2,000rpm help content... Should get no numeric reading ) through both ends of the early line of DOHC..

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