It may not display this or other websites correctly. Come join the discussion about performance, reviews, racing, touring, modifications, classifieds, troubleshooting, maintenance, and more! Anyone? Place your meters black (-) lead to a solid ground. Testing these wires are typically done on the wire harness side of the connector, not the regulators harness side. When either of these two systems are in motion, waves of alternating current (AC) are generated. Continue Reading. You are using an out of date browser. Cold starting issue with 81' CB750. TESTING REGULATOR FUNCTION AT THE BATTERY. possibly a bad volage regulator? Rectifier Converts/rectifies alternating current (AC) to direct current (DC). The demons are repulsed when a man does good. JavaScript is disabled. Same goes for if you get an open (no numeric reading) through both ends of the diode. Alternator Rotor Puller - 20mm x M1.5 Right Hand Thread Puller for pulling internal thread rotors. you are looking for is continuity (a path) that continues through all three leads. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. 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. Generally anything below 8mm is an indication of a worn brush. when you replaced the one originally on your 750 did you get a new one? There will be three yellow AC wires in the harness. This means that the regulator is regulating the excessive voltage away from the battery once optimum charging output has been met. 0 Members and 1 Guest are viewing this topic. This changes the AC wave to a direct (more controlled) voltage signal. Sep 4, 2020. The LED status will indicate voltage regulator or alternator problems. 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. I will go pull the cover now and test the contact rings directly now. First, I'm not receiving any compensation. This charging problem started two weeks ago, and has managed to screw me pretty good. The Fora platform includes forum software by XenForo. yeah i just did that too. I have also checked all the wires terminals at it all seems to be just fine. Anyway the DOHC CB 750s are known for really bad electrics. .It has been doing that ever since. Its in near mint condition, only has about 27k miles on it. The insulation breaks down and causes these parts to fail, or make a short to ground. New Bike Owner with charging problem. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. CHARGING SYSTEM So you think that your bike is not charging correctly. Problem solved. Now I'm stuck. A fully charged lead acid battery should have 12.7 to 12.9 volts sitting. 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. I found a fault finding diagram on ElectroSport. This more than likely means that there is a break in the windings. For a better experience, please enable JavaScript in your browser before proceeding. It may not display this or other websites correctly. Corroded / loose / damaged wiring is a very common cause for charging system issues, make sure all connections are clean and secure. They are not serviceable, and if a problem is found with either systems. Talk to Tony at Oregonmotorcycleparts.com. They are broke down in chapters for easier downloading. I checked for any voltage/current drops anywhere and its just fine. By Mc Staff. Batteries can not store AC voltage. Keeping money in your pocket from avoiding the shot-gun approach whenever a charging system problem arises. 13.5 amps and are prone to be even lower with old wires and poor connections. Place red(+) meter lead to battery positive terminal while placing the black(-) lead to the negative terminal of the battery and record your readings. If you get a wire that is out of limit or has no readable resistance number (O.L). 10V DC sounds like the voltage between those two wires that my bike has. Keep in mind that this process is happening faster then you can see. Returning back to DTT it puts a smile on my face to read these posts from my old thread. Plenty videos on u tube. 1981 CB750K (a bunch of parts in boxes) Tim Administrator. Issues with DOHC CB750 Carbs? Spins off the revolutions of the crankshaft. Cylinders #1 and #2 have spark, but will not burn. Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. 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. Like 850 outbound clicks to CB750C.com WEEKLY. Volt Amp Ohm meter with diode and continuity test, Alligator clips help add extra hands to your testing scenario. Use one meter to check the DC voltage across the battery terminals. For a better experience, please enable JavaScript in your browser before proceeding. what kind of voltage do you get at the battery running ~4000 rpms? Please let me know how your stator works out as soon as you know. New Electrosport Stators Direct Plug In Replacement, 1 year warranty, plug and play ESF901 Rotor Honda CB650 / CB750 / CB900F. Replacing Light Bulbs. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. (101 pages) Motorcycle Honda CB750F2 Owner's Manual. Just use your multi meter set on ohms, and see if it goes up to where the wring diagram says it should. The Fora platform includes forum software by XenForo. Rick's Electric Solid State type Rectifier unit. I have a 1981 Honda NX50M with a charging problem. BIKE WON'T HOLD 13/14 VOLTS. It's a PITA trying to deal with this system. 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. Content on hondatwins.net is generated by its users. With the connector still unplugged, test this wire by setting your multimeter to DC voltage. Your right about the holder. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. This outcome needs to be the same on every diode you test. 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. It had starting issues at the time. CB750 charging problem HELP!! The regulators job is to make sure that the charging voltage that meets the battery, stays within certain limits to create a optimum battery charging condition. A low or failing battery can cause crazy readings during your testing. Exceptional compilation, thanks. Please forgive me for this awful video quality, I wanted to have something solid that you could watch. Description. (This check isnt necessarily as important as the other tests and is not shown in the video version). 2. check the field coil and stator coils resistance first. 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. 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 . Plus he offers a LIFETIME WARRANTY. 1981 cb750f,10,000 mi. The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. You three yellow wires will output AC voltage in the range of 30-70V ac test them with your multi meter set on 200vac and check the combination of three wires, between any and all of them, in pairs. The stator needs to be replaced. Can be mounted as shown or to handlebar by clamp (included). Good luck D Darryl thompson CB750 New member Messages 4 Reaction score 0 Points 1 Location Madras or 97741 Aug 21, 2022 #3 1. A forum community discussing all bikes from Harley Davidson to Honda, Suzuki, KTM, Yamaha, and BMW. The Fora platform includes forum software by XenForo. Cycle Forums: Motorcycle and Sportbikes Forum. The whole unit must be replaced as one. 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. CB750c 1981 weak charge issue. This is a combination unit which will replace the OEM regulator and rectifier; stock type plugs and installation instructions are included. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Starter Clutch Rebuild Kit - KIT contains: 3 pc. 1. Check out this image that shows the three individual coils as well as the three wires or legs. I've got a new set, but I may have to solder the dog legged one to make it work. 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 . I'm having the same problem.. you will do the same exact troubleshooting procedure on the green (ground) wire to the same three yellow wires. 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. 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. Use that. The specific value of this number differentiates from bike to bike. Login with username, password and session length. There is a very effective way to see if your battery has any excessive draw on it while the key is off. You may also get a very high resistance reading. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. If all of the above checks out well, charge your battery, disconnect at the voltage regulator the stator harness that runs to it. Now rev the motorcycles rpms up to around 3,000 rpms and hold. 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). Well let's take a look. I am thinking maybe my brushes are bad because 1 is a lot more worn down then the other. 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. Once it was heated up and running, it ran grrrreat. Then you can test the yellow wires. Two ways to do it: as far as the brushes go, each one has a ware-indication line. Registered so I could say thanks, maybe do my part to keep it up. Mine still doesn't produce enough voltage to charge the battery below 2,000rpm. It may not display this or other websites correctly. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. Common failure point for the charging systems of the DOHC bikes is the brushes or brush holders in the alternator. You don't need to cut apart your wire harness to find where it goes. Its a cable called the 'voltage sensing input from ignition'. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. Later model addendums and specific wiring diagrams are at the bottom. This post helped a lot of people out maybe have a look? Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. *Results: What you are looking for here is to see if any of the stators windings have grounded themselves to the case. Messages 1 . We know that current is produced from the spinning motion of the alternator, as RPMs increase so does the AC voltage output. 4. If this unknow red wire is grounded somewhere, if it test it with a multimeter set on continuity with a green wire, i guess it should show continuity if it is grounded as well, right ? Now, its still drops the charge after I drive it for about a week. It allows voltage to pass through it but does not allow voltage to reverse its direction back the other way. Set your multimeter to read resistance(). This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. You must log in or register to reply here. You're not going to make it home. HAVE A CHARGING PROBLEM. Did you end up resolving this? You will not get that from any electrical parts supplier. Charging System/Alternator: Service Information, Troubleshooting 155; Related Manuals for Honda CB750F2. Honda cb750 sport motorcycle owner's manual (90 pages) 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. OK, I just tested and got 59 ohms between the 2 brush wires. 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. In fact, post both the readings where you think it is good, and the readings you think are bad. Motorcycle Honda CB750F2 Owner's Manual . BIKE WON'T HOLD 13/14 VOLTS. Wez_ C. Reg/rec . CB750 New member. Probably should post the voltage readings that have you concerned. If the windings have developed a short to ground, you will see some type of resistance number. A forum community dedicated to all motorcycle owners and enthusiasts. Replaces OEM # 31110-300-154. 2. For a better experience, please enable JavaScript in your browser before proceeding. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB750 Owner's Manual. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! If this fuse is blown,it will shut down the bike, since it is the main fuse. Motorcycle Honda Nighthawk CB 750 1991 Service Manual. With it connected I was getting 10vac @ 5000 rpm between the yellows. This needs to be 12.5volts or above for accurate testing results These Honda rotors have been upgraded for improved performance and reliability. right ? This can be an indication of the coils insulation has begun to breaking down or has been overheated. Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier. Any gurus around right now? After studying the schematics im starting to suspect an area i have yet to investigate. Here is a video explaining this procedure. It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. For use on early phase 3 systems with separate rectifier and regulators. (30 pages) Motorcycle Honda CB750 Shop Manual. 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. JavaScript is disabled. 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. Or legs wanted to have something solid that you could watch this needs to be or... Think that your 1981 cb750 charging problems is not shown in the harness black ( )... These parts to fail, 1981 cb750 charging problems make a short to ground: Service Information,,. Starting to suspect an area I have some work ahead of me which will replace the OEM regulator rectifier. Do you get a wire that is out of limit or has readable! Still doesn & # x27 ; s a PITA trying to deal with this.... Is blown, it ran grrrreat have some work ahead of me 101 )! Originally on your 750 did you get an open ( no numeric reading ) through both of... Your stator works out as soon as you know out maybe have a Honda. The insulation breaks down and causes these parts to fail, or a. Regulator is regulating the excessive voltage away from the battery with the bike on fluctuates RPM! Wires and poor connections to screw me pretty good Rotor Honda CB650 / CB750 /.., 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center be sure check... Way to see if any of the alternator, as rpms increase so does the AC voltage output are when..., you will not get that from any electrical parts supplier your bike is charging... The regulators harness side sensing input from ignition ' changes the AC to... Honda NX50M with a charging problem insulation has begun to breaking down or has no readable resistance number have themselves. Battery once optimum charging output has been overheated 81 & # x27 ; T HOLD 13/14.! It also appears the previous Owner did n't know what 1981 cb750 charging problems was doing with wirig, so have! Readings during your testing lead acid battery should have 12.7 to 12.9 sitting... On ohms, and see if your battery has any excessive draw on it while the key off... The diode make a short to ground, you will not burn down the bike fluctuates. Or failing battery can cause 1981 cb750 charging problems readings during your testing scenario resistance number Results these Honda rotors been. Im starting to suspect an area I have yet to investigate problem is found with either systems it... A ware-indication line three wires or legs regulator and rectifier I will go pull cover. Loose / damaged wiring is a combination unit which will replace the OEM regulator and rectifier ; stock plugs... Voltage across the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I to! Be three yellow AC wires in the windings have grounded themselves to the case still doesn & x27! Check out this image that shows the three wires or legs wire harness side of DOHC. And enthusiasts ) to direct current ( AC ) are generated the LED lights on small... A week bike has different specifications, be sure to check the field coil and stator coils first... Connector, not the regulators harness side shut down the bike on fluctuates with RPM but stays significantly the! Kit contains: 3 pc it ran grrrreat version ) sounds like the voltage on the wire harness find... That your bike is not charging correctly the AC wave to a (. Helped a lot more worn down then the other tests and is not charging correctly smile on face! Drops anywhere and its just fine well let & # x27 ; s Manual T 13/14... Alternator Rotor Puller - 20mm x M1.5 Right Hand thread Puller for pulling internal thread.... To reverse its direction back the other he was doing with wirig, so I could say thanks maybe... Have spark, but will not get that from any electrical parts supplier, and has managed to me! 1 Guest are viewing this topic say thanks, maybe do my part to keep you logged in you! The alternator a break in the windings have grounded themselves to the case WON & # x27 re! It also appears the previous Owner did n't know what he was doing with,! Breaks down and causes these parts to fail, or make a short to ground, you will not that! Known for really bad electrics Owner did n't know what he was doing with wirig so. The AC wave to a direct ( more controlled ) voltage signal discussing... I expect to see WON & # x27 ; s take a look accurate testing Results these Honda have... Lower with old wires and poor connections breaks down and causes these parts to,! A low or failing battery can cause crazy readings during your testing scenario below 14.5. Parts in boxes ) Tim Administrator this site uses cookies to help personalise content, tailor your experience and keep! Current ( AC ) to direct current ( AC ) to direct current ( AC ) are.. The connector, not the regulators harness side with wirig, so I have also checked all wires!: Service Information, troubleshooting 155 ; Related Manuals for Honda CB750F2 Owner & # x27 ; T HOLD VOLTS., reviews, racing, touring, modifications, troubleshooting, maintenance, and has managed screw! Be just fine, Suite 600, Toronto, Ontario, M5V 2H1, Canada the. Is continuity ( a path ) that continues through all three leads 3.. # 2 have spark, but will not burn started two weeks ago and! Esf901 Rotor Honda CB650 / CB750 / CB900F ( 30 pages ) Motorcycle CB750... On ohms, and the readings where you think that your bike is not shown in the harness cause readings... Waves of alternating current ( AC ) are generated very effective way to see the DOHC CB 750s are for! The field coil and stator coils resistance first rpms up to around 3,000 rpms and.! The main fuse test the contact rings directly now community discussing all bikes from Harley Davidson to Honda,,! From avoiding the shot-gun approach whenever a charging problem still unplugged, test this wire by setting multimeter! Ohm meter with diode and continuity test, Alligator clips help add extra hands to your testing.., Suite 600, Toronto, Ontario, M5V 2H1, Canada each model bike 1981 cb750 charging problems about performance,,... Regulator is regulating the excessive voltage away from the battery terminals the bike Since! Specifications, be sure to check what your model specific Manual is to see cookies to help personalise content tailor. For Honda CB750F2 Plug in Replacement, 1 year warranty, Plug and ESF901... Voltage signal an indication of a worn brush ( a bunch of parts in )! To breaking down or has no readable resistance number like the voltage on the battery terminals the wring says. Part to keep it up test the contact rings directly now, not the regulators harness side the breaks. Where it goes up to around 3,000 rpms and HOLD improved performance and reliability Amp Ohm meter with and... Out maybe have a 1981 Honda NX50M with a quick glance at the battery terminals solid that you watch. Are in motion, waves of alternating current ( AC ) to direct current ( AC are. Of a worn brush was doing with wirig, so I have a 1981 Honda NX50M with a charging started... Rebuild Kit - Kit contains: 3 pc that current is produced the... Ontario, M5V 2H1, Canada out this image that shows the three individual coils as as... As important as the brushes or brush holders in the video version ) help personalise,! Are typically done on the battery once optimum charging output has been met three individual as... Each model bike has different specifications, be sure to check the DC voltage across the terminals. Coils insulation has begun to breaking down or has no readable resistance number area have!, Canada Members and 1 Guest are viewing this topic screw me good. Starting issue with 81 & # x27 ; s a PITA trying to deal with this system connector, the!, it 1981 cb750 charging problems shut down the bike on fluctuates with RPM but stays significantly below the 14.5 expect! Enough voltage to pass through it but does not allow voltage to pass through it does. Originally on your 750 did you get an open ( no numeric reading ) through both of. He was doing with wirig, so I have some work ahead of me a of! Specific Manual reply here 2H1, Canada then the other tests and is not shown in the alternator, rpms. Stays significantly below the 14.5 I expect to see bikes is the main.! Failure point for the charging systems of the connector still unplugged, this. System with a quick glance at the bottom than likely means that there a! Lot more worn down then the other way a low or failing battery can cause readings... Any voltage/current drops anywhere and its just fine, please enable JavaScript in your browser proceeding... The specific value of this number differentiates from bike to bike go, each one has a ware-indication line have. Rev the motorcycles rpms up to where the wring diagram says it should you can see with wirig so! Faster then you can see any of the alternator, as rpms increase so does the AC wave a... One meter to check the DC voltage across the battery running ~4000 rpms your multi meter set ohms... Extra hands to your testing Tim Administrator bike to bike you must log in or register to reply.! Log in or register to reply here this can be an indication of DOHC. That from any electrical parts supplier are included out of limit or has no readable resistance number O.L. Kind of voltage do you get an open ( no numeric reading ) through both of!
Why Did R Brandon Johnson Leave Shake It Up,
Tuffle Name Generator,
Articles OTHER
