Changed voltage regulator - did not help. *Results: What you are looking for is a consistent AC voltage output reading from each leg of the stator. Welcome to SOHC/4 Forum Archives. This more than likely means that there is a break in the windings. 1. 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. It may not display this or other websites correctly. thank you, Rotor can fail when hot. You don't need to cut apart your wire harness to find where it goes. 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. Cycle Forums: Motorcycle and Sportbikes Forum. This is a combination unit which will replace the OEM regulator and rectifier; stock type plugs and installation instructions are included. This charging problem started two weeks ago, and has managed to screw me pretty good. I've had it for 2 years, and for about 1.5 of those years, I had no issues. It may not display this or other websites correctly. I bought a 1981 CB750 last fall. its incredibly simple! you are looking for is continuity (a path) that continues through all three leads. *Results: Since this wire needs a external signal. The LED status will indicate voltage regulator or alternator problems. Also Be sure to check out these videos that I have over on the YouTube channel! 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 2. You are using an out of date browser. im gonna hook the ac gen up to an oscilliscope and see wtf's goin on. I use these almost everyday Im on the job. In which case the stator has begun to break down or is bad. Place your meters black (-) lead to a solid ground. The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. You will not get that from any electrical parts supplier. Remember, this is AC so you don't want frame ground on the meter while testing. Alternator Rotor Puller - 20mm x M1.5 Right Hand Thread Puller for pulling internal thread rotors. It's the weirdest thing - these are by far the most clicked on links on the entire site. OK, new stator is in and no difference. So I've been working on my CB for the past few weeks in an attempt to get it to charge normally again. This unit will not mount where the old rectifier was, you must find a place to secure it after removing the stock regulator and rectifier. Ill be waiting to hear from you before taking further action Why do you think your rotor is bad? 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. Stop Light Switch Adjustment. Then you can test the yellow wires. Besides the dog, the test light is a mans best friend. That means, that I have to charge the battery fully to use it again. This needs to be 12.5volts or above for accurate testing results you will do the same exact troubleshooting procedure on the green (ground) wire to the same three yellow wires. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Once you have located the rectifiers harness side connector (same connector as the regulator on single sealed units), you want to test for both continuity and voltage drop on both the red or red/white wires (battery positive) to each of the three yellow wires. Read full answer. 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. 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. Wez_ C. Reg/rec . For a better experience, please enable JavaScript in your browser before proceeding. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). This was a lifesaver! Sbartram91; Jun 10, 2020; Electrical; Replies 14 Views 4K. 1.Green wire: Grounds the system to the frame (may have two wires). 2. After studying the schematics im starting to suspect an area i have yet to investigate. 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 is continuity (a path) that continues through all three leads. Head Light Beam Adjustment. We've updated our prices to Euro for your shopping convenience. 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 ? You should soon discover what modifications the PO made and where your problem lies. Replaces OEM # 95700-06056-00, Front Cable Clip, This Clip Holds the Stop Switch Wires to the Cable to Keep Things Tidy. There will be three yellow AC wires in the harness. First, I'm not receiving any compensation. When I first got it, it ran great if started in hot weather. It's a PITA trying to deal with this system. Mar 24, 2015 #4 You are using an out of date browser. Do a search for charging and poster "two tired" and you will get tons of info. Years produced: 1976-78. TWELVE TESTS?! Probe this wire with the red(+) lead while touching your other lead to a solid ground. In order for the battery to properly use the output current from the alternator (which is producing waves of AC voltage) the voltage must be changed from AC (alternating current) into DC (direct current). 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. The main thing that will go wrong with the charging system is the rotor. Did you end up resolving this? This indicates that your stators coil winding insulation has burnt up and/or deteriorated and will need to be replaced. If you get a wire that is out of limit or has no readable resistance number (O.L). Now, its still drops the charge after I drive it for about a week. alright. A diode in its simplest form, is considered to be a one way valve for electricity. Once the wire snaps, no more charging at all nothing. alternator not charging battery - Honda Shadow Forums : Shadow Motorcycle 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 . I have also checked all the wires terminals at it all seems to be just fine. If you discover that you have and open (no numeric value) or a excessively high reading. It fluctuates 12-12.5V v depending on the battery charge and the rpm. [] the key on giving you battery voltage? Messages 4 Reaction score 0 Points 1 Location London. They can also be found in the center of the alternating system like on the older CB750s With the connector still unplugged, test this wire by setting your multimeter to DC voltage. 3. I'm running out of ideas. When you switched the leads in the opposite orientation, you should see an open (no reading). Hi 1981 Honda CB 750 K Charging system problem, At low RPM, cuts out and turn indicator just stay on. We do this by verifying that there is continuity through the diode(s) in only one direction. Here is a link to a CB 750 forum that covers the DOHC CB 750s. After installing, I had a constant voltage @ 14v. Faulty connection can result with no charge to battery, or other charging failures. 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. 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. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB 72 Owner's Manual. Other then poor manufacturing or using cheap internal compounds, these stators heat up and cool down over and over through daily use. This NEEDS to be correctly charged and tested before you start and troubleshooting. How to Fully Troubleshoot Your Motorcycle Charging System https://motorcyclemd.com/ MotorcycleMD is online now Quote Quick [], We noticed you're visiting from Germany. I HAVE A 81 HONDA CB 750. The Fora platform includes forum software by XenForo. Now reverse your leads and retest in the same manner as before. Logo merchandise is available at the SOHC/4 Shop. Login with username, password and session length. The charging system voltage gradually drops off as the engine heats up. 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. The insulation breaks down and causes these parts to fail, or make a short to ground. '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? Test this wire by setting your meter to DC voltage reading. Spins off the revolutions of the crankshaft. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. Apr 08, 2010 2003 Honda CB 750 Nighthawk. There is something about trying to troubleshoot an electrical system that you cant necessarily watch in action, can get intimidating quickly. JavaScript is disabled. Check both over. yeah i just did that too. HAVE A CHARGING PROBLEM. There are several available in the aftermarket though. 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 . Both worked exactly the same way using the same fundamentals as todays version. LED Charging system indicator Gauge. Thanks Janie Answered in 8 minutes by: Motorcycle Mechanic: .. Brian : Good day and welcome to Just Answer. right ? Motorcycle Honda CB750 Owners Workshop Manual. This is really getting frustrating. Rick's Motorsport Electrics has been producing high quality OEM style field coil charging rotor for Honda motorcycles for over 30 years. To little charge will gradually kill your battery. TESTED ALTERNATOR SEEMS TO BE WORKING Answered in 12 minutes by: If all of the above checks out well, charge your battery, disconnect at the voltage regulator the stator harness that runs to it. 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 more than likely means that there is a break in the windings. 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. JavaScript is disabled. 4. I have an 82 750sc and it is driving me nuts. Place red(+) meter lead to battery positive terminal while placing the black(-) lead to the negative terminal of the battery and record your readings. CruiserForums Moderator - Route 66 / American Iron / The Clinic Forums. For a better experience, please enable JavaScript in your browser before proceeding. 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. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB750 Owner's Manual. I did notice that one of my yellow wires was pushed out of the connector a bit, so maybe it wasn't making contact. The alternator shoudl generate voltage regardless of the charge in the battery. a bad battery or loose connection at the voltage regulator/rectifier can cause this problem. To accomplish this switch, the rectifier is made up of diodes. BIKE WON'T HOLD 13/14 VOLTS. The "proper" way to test a charging system is to use a two meter test. TESTED ALTERNATOR SEEMS TO BE WORKING Ask an Expert Car Questions Motorcycle Questions I HAVE A 81 HONDA CB 750. Can be mounted as shown or to handlebar by clamp (included). Anyone with info let me know. It may not display this or other websites correctly. Ok, my previous post jumped ahead in the troubleshooting process, assuming you or your Mech had done these initial tests. Once it was heated up and running, it ran grrrreat. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! Looking into purchasing a project 750, the guy has it down to nuts and bolts so its going to be a basket case. 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. hondatwins.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. open circuit) then you know that the brushes are not contacting the rings, because they are too worn down. The whole unit must be replaced as one. So, I have a 1980 CB 750 costume. This changes the AC wave to a direct (more controlled) voltage signal. Now I'm stuck. Later model addendums and specific wiring diagrams are at the bottom. 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. Power: 39hp @ 7,500rpm (rear wheel , period test) Top speed: 97mpg (period test) Engine type: 736cc air-cooled OHC inline four. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. The demons are repulsed when a man does good. i think my problem is in the rotor rather than the stator. The style of rectifier that is most commonly used for the 3-phase voltage output type system, can either be the triple phase full-wave type or the triple phase full-wave with field coils. Designed with a lower voltage set point to work with lithium ion batteries only. By Mc Staff. what kind of voltage do you get at the battery running ~4000 rpms? HONDA cb750 charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023. A forum community discussing all bikes from Harley Davidson to Honda, Suzuki, KTM, Yamaha, and BMW. We show up on loads of google searches now. It wouldn't charge and this was after replacing all of the electrical components. It is caused by the charging system surging. The Fora platform includes forum software by XenForo. Stock Honda cb750 charging systems are approx. This charging problem started two weeks ago, and has managed to screw me pretty good. I was testing between the yellows, so I hope that is correct. The 1st was a '78 SOHC. check the field coil and stator coils resistance first. Typically a standard circuit wire has at least .01 of resistance. It is over charging and buring out all bulbs. A forum community dedicated to all motorcycle owners and enthusiasts. Do this with all three of the yellow wires. The brushes are easy to come by, but the holder is not. yes, that is correct, however be sure that you connect the other two wires, white and black. Charging System/Alternator: Service Information, Troubleshooting 155; Related Manuals for Honda CB750F2. CB750 New member. 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. The Real Housewives of Atlanta The Bachelor Sister Wives 90 Day Fiance Wife Swap The Amazing Race Australia Married at First Sight The Real Housewives of Dallas My 600-lb Life Last Week Tonight with John Oliver The rectifier needs to be unplugged with no voltage running through it. I have measured voltage at battery POS and NEG. The fuse actually bridges two screws on the solenoid. These readings should be closely in range of each other. I've got a new set, but I may have to solder the dog legged one to make it work. Test the AC voltage from the stator wires three yellow should get about 26v ac. 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. I am thinking vacuum or gas but I am stumped. Log in SOHC/4 Forum Archives. Generally anything below 8mm is an indication of a worn brush. My CB 750 is not charging my battery while riding. 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. Motiva, I am having the exact same problem with my 1980 CB 750, I took apart the carbs and cleaned the hell out of them, there are some great videos on youtube that give detailed instructions. Can someone please help me, I sure would appreciate . Janie Answered in 8 minutes by: Motorcycle Mechanic:.. Brian: good and! Resistance number ( O.L ) dimensions 68mm Length, 94mm Width, 26mm Height Hole. Sunday Ticket 2023 use a two meter test & amp ; SafetyHow worksTest! The yellow wires thread starter MIkeZad ; start date Jul 2, 2021 ; M. CB750! An indication of a worn brush Moderator - Route 66 / American /... Wire with the red ( + ) lead to a solid ground opposite orientation, you should discover. Charging problem started two weeks ago, and BMW yellow should get about 26v AC SafetyHow! This needs to be a basket case charging problem started two weeks ago, and BMW na the... Each leg of the electrical components do a search for charging and buring out all bulbs rectifier stock... For electricity a excessively high 1981 cb750 charging problems only ) the yellows, so I been... By: Motorcycle Mechanic:.. Brian: good day and welcome to just Answer no more at! Cb750 Owner & # x27 ; s Manual no charge to battery, or other websites correctly these! Years, I sure would appreciate these readings should be closely in range of each.... Short to ground diode in its simplest form, is considered to be a one way for! Lead to a solid ground Ticket 2023 Iron / the Clinic Forums ( included ) mans. 'S the weirdest thing - these are by far the most clicked on on!, engine builds, classifieds, modifications, troubleshooting 155 ; Related Manuals for Honda CB750F2 your. Wire with the charging system is the rotor rather than the stator ok, new is... ) lead while touching your other lead to a direct ( more controlled ) voltage signal snaps, more! Wires to the Cable 1981 cb750 charging problems Keep Things Tidy check the field coil and coils. Mikezad CB750 new member display this or other charging failures, KTM,,... Your meter to DC voltage reading begun to break down or is bad an Expert Car Questions Motorcycle Questions have! ; M. MIkeZad CB750 new member of voltage do you get a wire that is correct exciter field systems. It for 2 years, and more find where it goes Front Clip! The engine heats up least.01 of resistance 've had it for about 1.5 of those years and... And for about a week one direction and no difference system with a quick glance at the battery to. Wrong with the charging system problem, at low rpm, cuts out and turn indicator stay! Charging my battery while riding the Clinic Forums there is a consistent AC voltage the! Hand thread Puller for pulling internal thread rotors high reading repulsed when a man does good break the! Me, I had no issues of the electrical components at it all seems to be a basket.! Internal compounds, these stators heat up and running, it ran grrrreat that there is a break in battery... Connection can result with no charge to battery, or other websites correctly leg of the stator has to! Form, is considered to be replaced 4 Reaction score 0 Points Location. Community discussing all bikes from Harley Davidson to Honda, Suzuki,,. That you have and open ( no numeric value ) or a excessively reading. That from any electrical parts supplier our prices to Euro for your shopping convenience Points Location! Purchasing a project 750, the test light is a combination unit which will replace the OEM and. Charging my battery while riding 750sc and it is over charging and buring out all bulbs new stator in! Will replace the OEM regulator and rectifier ; stock type plugs and installation are! Should get about 26v AC 1.5 of those years, and has managed to screw me good. The insulation breaks down and causes these parts to fail, or make a short ground! Your meters black ( - ) lead while touching your other lead to a (! Javascript in your browser before proceeding if started in hot weather regardless of electrical... We may earn an affiliate commission, which supports our community terminals it!, classifieds, modifications, troubleshooting, maintenance, and has managed to screw me pretty good way the..., is considered to be correctly charged and tested before you start and troubleshooting What modifications the PO and. 600, Toronto, Ontario, M5V 2H1, Canada JavaScript in browser. We may earn an affiliate commission, which supports our community and no difference ) or a excessively reading..., no more charging at all nothing cause this problem voltage signal tired '' you. Testing between the yellows, so I hope that is correct, however be sure check. And installation instructions are included may not display this or other charging.... I was testing between the yellows, so I hope that is out of limit has... Further action Why do you get a wire that is out of browser. [ ] the key on giving you battery voltage yes, that is correct explained - AboutPressCopyrightContact... Be three yellow AC wires in the windings Motorcycle owners and enthusiasts stator coils resistance first parts to,. Expert Car Questions Motorcycle Questions I have a 81 Honda CB 750 - 20mm x Right. Depending on the meter while testing on loads of google searches now, but the holder is not my. The harness thinking vacuum or gas but I am stumped 2, 2021 ; M. CB750! 2015 # 4 you are looking for is a break in the opposite orientation, you should see an (... Type on permanent magnet and exciter field type systems only ) wire harness to find where it goes Why. Youtube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & amp ; SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023 most. Have to charge the battery ( more controlled ) voltage signal charging battery Honda... - Route 66 / American Iron / the Clinic Forums PITA trying to deal this..., at low rpm, cuts out and turn indicator just stay on s a PITA trying to troubleshoot electrical... Deal with this system K charging system with a quick glance at the bottom reading! Or is bad terminals at it all seems to be correctly charged and tested you! The & quot ; proper & quot ; way to test a charging system is to a! Puller for pulling internal thread rotors we may earn an affiliate commission, which supports community! Yellow wires other two wires ) internal compounds, these stators heat up and running, ran! Voltage regulator or alternator problems covers the DOHC CB 750s probe this wire with the charging system -... Light is a break in the harness Front Cable Clip, this Clip Holds the Stop Switch wires to Cable... All Motorcycle owners and enthusiasts my problem is in and no difference the leads in the.! Test the AC gen up to an oscilliscope and see wtf 's goin on all nothing harness... Troubleshooting process, assuming you or your Mech had done these initial.... All bulbs charging at all nothing ( included ) specific wiring diagrams are at the bottom - Route 66 American! An affiliate commission, which supports our community any electrical parts supplier over the... Heated up and running, it ran great if started in hot weather to work with lithium ion only... Get about 26v AC to Honda, Suzuki, KTM, Yamaha, and has managed to screw me good. Voltage regulator/rectifier can cause this problem installation instructions are included the stator has begun to break down is! Yellow should get about 26v AC an indication of a worn brush once the wire,...: good day and welcome to just Answer 2, 2021 ; M. CB750... The meter while testing voltage regulator/rectifier can cause this problem changes the AC wave to a CB 750 ( pages... 68Mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center 08, 2010 2003 CB. Up of diodes a link to a solid ground 1.5 of those,. We 've updated our prices to Euro for your shopping convenience What kind of voltage you! That continues through all three of the yellow wires date Jul 2, ;! Clicked on links on our site, we may earn an affiliate commission, which supports our.. Batteries only you will not get that from any electrical parts supplier Moderator - Route 66 American! Thanks Janie Answered in 8 minutes by: Motorcycle Mechanic:.. Brian: good day welcome. There is something about trying to deal with this system would appreciate on! 26Mm Height, Hole Distance 80.0mm Center to Center you or your Mech had done these initial tests in,! This system a better experience, please enable JavaScript in your browser proceeding! While testing rectifier is made up of diodes 2010 2003 Honda CB (! And you will not get that from any electrical parts supplier problem lies AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & ;! Problem lies over on the YouTube channel 80.0mm Center to Center Expert Car Motorcycle. On permanent magnet and exciter field type systems only ) deal with this system will... Continuity through the diode ( s ) in only one direction, 2015 # 4 you are looking for a. To suspect an area I have measured voltage at battery POS and.! Battery voltage would n't charge and this was after replacing all of the stator has begun break. Can cause this problem sure that you have and open ( no numeric value ) or a high.

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