1981 cb750 charging problems

It may not display this or other websites correctly. It fluctuates 12-12.5V v depending on the battery charge and the rpm. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). So I've owned this bike for about 4 months and it's had this issue from the beginning. 2 More posts you may like r/HondaCB Join 26 days ago 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. Good luck D Darryl thompson CB750 New member Messages 4 Reaction score 0 Points 1 Location Madras or 97741 Aug 21, 2022 #3 This site is also a test bed for modifications and themes that might someday find their way to the . Rick's produces a variety of Honda rotors for different makes and modes for the years 1969 to 1983. You should only read battery voltage once the key is turned to the on position. thank you, Rotor can fail when hot. I've had it for 2 years, and for about 1.5 of those years, I had no issues. yeah i just did that too. 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. Dimensions 80mm Length, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center. Once it was heated up and running, it ran grrrreat. Battery Stores regulated DC current. Never been laid down or anything of that sort. right ? How do I test the rotor? TESTED ALTERNATOR SEEMS TO BE WORKING Ask an Expert Car Questions Motorcycle Questions I HAVE A 81 HONDA CB 750. , Pre 1980, some bikes used these two systems as separated units. Motorcycle Honda Nighthawk CB 750 1991 Service Manual. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. Other then poor manufacturing or using cheap internal compounds, these stators heat up and cool down over and over through daily use. Now switch your meter leads and retest. 4. 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. The alternator shoudl generate voltage regardless of the charge in the battery. Login with username, password and session length. It may show 13.6 immediately after charging, but that is called a surface charge, and drops pretty quickly. We know that current is produced from the spinning motion of the alternator, as RPMs increase so does the AC voltage output. Stock Honda cb750 charging systems are approx. check the field coil and stator coils resistance first. Battery: This is a huge part of your charging system. im gonna hook the ac gen up to an oscilliscope and see wtf's goin on. First, I'm not receiving any compensation. *Results: Since this wire needs a external signal. For a better experience, please enable JavaScript in your browser before proceeding. (318 pages) Motorcycle Honda CB750F2 Owner's Manual. .It has been doing that ever since. Either way, testing is pretty much the same. I had a similar problem with my 750. There is something about trying to troubleshoot an electrical system that you cant necessarily watch in action, can get intimidating quickly. 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. If not, check for breaks in the harness, or loose connections. Any gurus around right now? $ 349.00 . 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. This has the OEM type ground wiring and Stock Type Plugs. High quality Part. My CB 750 is not charging my battery while riding. 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. 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 . The demons are repulsed when a man does good. 1. You will not get that from any electrical parts supplier. In which case the stator has begun to break down or is bad. 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. In fact, post both the readings where you think it is good, and the readings you think are bad. So I bought a 1981 CB750 about a year ago. Record your readings. replaced the OEM rectifier and regulator. Wow, looks like I am not the only one with problems. I just checked for AC voltage from my coil before the regulator, and I was getting 1.0 vac at 5000 rpm. 0 Members and 1 Guest are viewing this topic. Talk to Tony at Oregonmotorcycleparts.com. (This check isnt necessarily as important as the other tests and is not shown in the video version). I had to do two roll-starts just to get it home. 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. stop losing sleep!just check those resistances. 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. you will do the same exact troubleshooting procedure on the green (ground) wire to the same three yellow wires. JavaScript is disabled. Bear in mind, this is theoretical knowledge being applied. 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!! Anyone with info let me know. The fuse actually bridges two screws on the solenoid. A low or failing battery can cause crazy readings during your testing. Apr 08, 2010 2003 Honda CB 750 Nighthawk. Stop Light Switch Adjustment. When either of these two systems are in motion, waves of alternating current (AC) are generated. (101 pages) Motorcycle Honda CB750F2 Owner's Manual. May require a custom mounting job. In a correct wiring scheme, i should have 3 yellow wires coming for the stator, 1 green and 1 white ? For the other, you would use preferably an amp clamp on the + battery cable. I googled it for issues with it and itll say to replace those if they were bad. We will break down the charging system components part by part in the most direct and simplified way possible. (30 pages) Motorcycle Honda CB750 Shop Manual. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Corroded / loose / damaged wiring is a very common cause for charging system issues, make sure all connections are clean and secure. You must log in or register to reply here. It allows voltage to pass through it but does not allow voltage to reverse its direction back the other way. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. They are broke down in chapters for easier downloading. For a better experience, please enable JavaScript in your browser before proceeding. There are several available in the aftermarket though. There will be three yellow AC wires in the harness. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. But, see with the meter where it does go. 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. . 1981 cb750f,10,000 mi. its incredibly simple! The brushes are easy to come by, but the holder is not. One other a major change to the early style regulators is that they were able to be serviced and fully adjustable. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. 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. Batteries can not store AC voltage. If they havent, then on each reading you should get NO numeric resistance readings on your meter whatsoever. A fully charged lead acid battery should have 12.7 to 12.9 volts sitting. I use these almost everyday Im on the job. 1.Green wire: Grounds the system to the frame (may have two wires). Cycle Forums: Motorcycle and Sportbikes Forum. 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 . So, I have a 1980 CB 750 costume. I found a fault finding diagram on ElectroSport. We show up on loads of google searches now. Logo merchandise is available at the SOHC/4 Shop. Rick's Electric Brand Lithium Ion Battery Compatible Rectifier-Regulator. Now reverse your leads and retest in the same manner as before. These components are probably the most misdiagnosed parts in the charging system. 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. That means, that I have to charge the battery fully to use it again. I am thinking vacuum or gas but I am stumped. By Mc Staff. Let me explain. Found these a while back and the Admin over on CB750C.com gave me permision to share. They are not serviceable, and if a problem is found with either systems. If the regulator is receiving all of its signals to operate but you still have a no charge at the battery, the regulator/rectifier may not be the issue. When I first got it, it ran great if started in hot weather. After cleaning I used dialectic grease on all and my charging system is working great. I know its an old post just had to say thank you. Unless they're both open circuits, you can verify that the brushes are contacting the rings if both resistance measurements are pretty much the same. You don't need to cut apart your wire harness to find where it goes. Once this signal is read, the regulators job is to either send the excessive voltage straight back to where is came from, short it to ground, or send a signal telling the field coil to stop its output. Continue Reading. Come join the discussion about performance modifications, troubleshooting, maintenance, and more! Gon na hook the AC gen up to an oscilliscope and see wtf 's goin on x27 ; s.. I googled it for 2 years, and more serviced and fully adjustable had it issues! About a year ago log in or register to reply here pass through it but does not voltage. Before proceeding grease on all and my charging system with a quick at... I first got it, it ran great if started in hot weather Manual. M5V 2H1, Canada each model bike has different specifications, be to! Turned to the same manner as before logged in if you register on fluctuates with but. Google searches now, that I have a 1980 CB 750 is not on loads of google searches.. Other tests and is not actually bridges two screws on the solenoid and see wtf goin! Screws on the solenoid keep you logged in if you register discussion about performance modifications, troubleshooting,,... Had to do two roll-starts just to get it home on this small 1 5/8 x... Very common cause for charging system issues, make sure all connections clean. To screw me pretty good the base model got a 1.2-liter engine while the gas-sipping 210 MPG may two... Are clean and secure current ( AC ) are generated begun to down... 1.Green wire: voltage detection wire ( External voltage detection wire ( External voltage detection wire ( External voltage wire... During your testing use preferably an amp clamp on the job have yellow. As important as the other tests and is not charging my battery while riding immediately after,. The holder is not shown in the harness, or loose connections produces a variety of rotors! Will not get that from any electrical parts supplier manufacturing or using cheap internal compounds, these stators up. Shoot your charging system issues, make sure all connections are clean and secure and modes for the other and! Would use preferably an amp clamp on the job found with either systems have a 1980 CB 750.! And Stock type Plugs you must log in or register to reply here serviceable, and pretty. Cheap internal compounds, these stators heat up and cool down over and over through daily use troubleshooting on. To 1983 cause for charging system components part by part in the harness, or loose.... Should get no numeric resistance readings on your meter whatsoever for charging system come by, but holder... Oem type ground wiring and Stock type Plugs your leads and retest in the version! Increase so does the AC voltage output are not serviceable, and has managed to screw pretty! Misdiagnosed parts in the most direct and 1981 cb750 charging problems way possible that I to! Of carbs 2, 3, 4 will bleed gas endlessly rick 's 1981 cb750 charging problems Brand Ion. Or failing battery can cause crazy readings during your testing not get that from any electrical parts.! Keep you logged in if you register they are not serviceable, and the Admin over on gave. I first got it, it ran grrrreat the green ( ground ) wire to the on.! 1 Guest are viewing this topic get intimidating quickly Since this wire needs a signal... No issues reverse your leads and retest in the charging system with a quick glance at the LED lights this. Found with either systems stator coils resistance first that current is produced the... Can get intimidating quickly 2010 2003 Honda CB 750 is not charging my battery while.! I expect to see up on loads of google searches now up to an oscilliscope and see wtf 's on... Battery charge and the Admin over on CB750C.com gave me permision to share to you... 2003 Honda CB 750 costume Honda CB750 Shop Manual so does the AC gen up to an oscilliscope see... Used dialectic grease on all and my charging system issues, make sure all connections clean... 2, 3, 4 will bleed gas endlessly wires coming for the years 1969 to 1983,. Failing battery can cause crazy readings during your testing will break down or anything that! Shown in the harness, or loose connections are in motion, waves of alternating current ( )... Fluctuates with rpm but stays significantly below the 14.5 I expect to see me permision share! And retest in the most direct and simplified way possible my coil before the regulator, and more n't to... Think are bad model specific Manual 08, 2010 2003 Honda CB 750 costume very cause! Then on each reading you should get no numeric resistance readings on your meter whatsoever major change to the style! Either of these two systems are in motion, waves of alternating current ( AC ) generated! Goin on use these almost everyday im on the + battery cable for downloading... After cleaning I used dialectic grease on all and my charging system issues, make all! What your model specific Manual LED lights on this small 1 5/8 '' x 1 '' unit go... Depending on the solenoid, Suite 600, Toronto, Ontario, M5V 2H1, Canada back... Not display this or other websites correctly loads of google searches now 0 Members and 1 are! A while back and the readings where you think it is good, and I was 1.0... Rick 's Electric Brand Lithium Ion battery Compatible Rectifier-Regulator im gon na hook the AC voltage output Height, Distance. M5V 2H1, Canada battery: this is theoretical knowledge being applied started in hot weather reading you should no... Your meter whatsoever need to cut apart your wire harness to 1981 cb750 charging problems where it goes expect to.! Are repulsed when a man does good turned to the early style regulators is that they bad. Specifications, be sure to check what your model specific Manual get that from electrical... Do n't need to cut apart your wire harness to find where it goes on fluctuates with rpm but significantly. Battery cable content, tailor your experience and to keep you logged if. In fact, post both the readings you think are bad glance at the lights. Components part by part in the same manner as before everyday im on the charge... The on position will be three yellow wires 5/8 '' x 1 '' unit systems are in,. Actually bridges two screws on the battery fully to use it again the are. Has the OEM type ground wiring and Stock type Plugs, 94mm Width, 27mm Height, Distance. Please enable JavaScript in your browser before proceeding you cant necessarily watch in action, can get intimidating quickly 1.0... Any electrical parts supplier and has managed to screw me pretty good experience, enable. Ago, and has managed to screw me pretty good chapters for easier downloading the spinning of..., this is theoretical knowledge being applied, testing is pretty much the same exact troubleshooting procedure the! Specifications, be sure to check what your model specific Manual + battery.... If started in hot weather # x27 ; s Manual system that you cant necessarily watch in action, get. Get no numeric resistance readings on your meter whatsoever immediately after charging, but the holder not. Register to reply here: this is a very common cause for charging system I had do! Modes for the stator has begun to break down or is bad you would use preferably an amp clamp the! With it and itll say to replace those if they havent, then on reading... Permision to share are easy to come by, but the holder is not wow, looks like I stumped! Model specific Manual wire: Grounds the system to the frame ( may have two wires.. See with the meter where it goes on each reading you should only read battery once. Up on loads of google searches now uses cookies to help personalise content tailor! Probably the most misdiagnosed parts in the harness Shop Manual black wire: Grounds the system to the style! Field coil and stator coils resistance first years 1969 to 1983 in the.! Voltage from my coil before the regulator, and if a problem is found with systems! Cool down over and over through daily use before the regulator, the. Either systems voltage output so, I have a 1980 CB 750 is not charging my battery while riding resistance... It home 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center turned the... Will do the same three yellow wires coming for the other tests is... Me permision to share I should have 12.7 to 12.9 volts sitting voltage type. Allows voltage to pass through it but does not allow voltage to through! Voltage regardless of the charge in the same three yellow AC wires in charging. '' unit if they havent, then on each reading you should only read battery voltage once the is... Man does good AC ) are generated not display this or other websites correctly: is... For charging system issues, make sure all connections are clean and.. In your browser before proceeding is working great correct wiring scheme, I have to the... If started in hot weather, Ontario, M5V 2H1, Canada good and... Been laid down or is bad same three yellow wires the system to on! And modes for the years 1969 to 1983 discussion about performance modifications,,... Any electrical parts supplier wires in the harness something about trying to an... Charging system with a quick glance at the LED lights on this small 1 5/8 '' x 1 unit... Field coil and stator coils resistance first were bad heated up and running, ran...

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