Its in near mint condition, only has about 27k miles on it. 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. Anyway the DOHC CB 750s are known for really bad electrics. a bad battery or loose connection at the voltage regulator/rectifier can cause this problem. These wires exit out of the engines side cover on either the left or right side. This had all of my factory resources and more. 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. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. This more than likely means that there is a break in the windings. This site is also a test bed for modifications and themes that might someday find their way to the . Thisrocks. Instructions not included. This more than likely means that there is a break in the windings. It's the weirdest thing - these are by far the most clicked on links on the entire site. 1. 0 Members and 1 Guest are viewing this topic. Registered so I could say thanks, maybe do my part to keep it up. Rectifier Converts/rectifies alternating current (AC) to direct current (DC). Dynatek Charge Monitor. High quality Part. These Honda rotors have been upgraded for improved performance and reliability. I've got a new set, but I may have to solder the dog legged one to make it work. With the bike running, test all three for AC voltage with a multimeter. 2 More posts you may like r/HondaCB Join 26 days ago Wez_ C. Reg/rec . The electromagnet or (field coil) simply means that an additional coil in placed near the stator and receives its own separate voltage signal to help it become its own electromagnet) A coil is simply an iron core with copper windings. This is our 1981 cb750c, in this video i go through all the problems we had with the build in general, but also go over what has worked jetting wise on getting this bike to run decently with. Never been laid down or anything of that sort. 3. After installing, I had a constant voltage @ 14v. 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. If all of the above checks out well, charge your battery, disconnect at the voltage regulator the stator harness that runs to it. Almost all reg/recs now-a-days are combined into one sealed unit. If you get a resistance reading through both ways on the diode. New Bike Owner with charging problem. Mar 24, 2015 #4 Replacing Light Bulbs. when you replaced the one originally on your 750 did you get a new one? Login with username, password and session length. This single topic has pulled my trusty and faithful Beast from crates at least 5 times now. CruiserForums Moderator - Route 66 / American Iron / The Clinic Forums. alternator not charging battery - Honda Shadow Forums : Shadow Motorcycle Forum. Thank you for your response Dan. CB750 New member. News: About this forum - The posts here were archived from the old SOHC/4 forums that were active from 2000 through 2005. Looking into purchasing a project 750, the guy has it down to nuts and bolts so its going to be a basket case. Since AC current is alternating back and forth from positive to negative in its own waveform. So, I have a 1980 CB 750 costume. We've updated our prices to Euro for your shopping convenience. Well let's take a look. OK, new stator is in and no difference. The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. Remove C first, you may be able to see if the PO hacked into the original wiringLarry, Ok wiring is all good, from the stator and under the cover i have 3 yellow wires, green, white but also the neutral switch wire and the oil pressure wire. Spins off the revolutions of the crankshaft. I did some searching, and so far was unable to find a posting that clearly relates to my problem. The fuse actually bridges two screws on the solenoid. The headlight and stock tail light use about 42-48 watts. *Results: The goal here is to make sure that a resistance reading is noted in only one direction of each diode. Thanks. 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 had a similar problem with my 750. With it connected I was getting 10vac @ 5000 rpm between the yellows. Now, its still drops the charge after I drive it for about a week. We know that current is produced from the spinning motion of the alternator, as RPMs increase so does the AC voltage output. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. *Results: This wire should have constant battery voltage even with the key off. 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. After studying the schematics im starting to suspect an area i have yet to investigate. Rollers (15 x 13), Starter Clutch Roller Spring, Replaces OEM # 28125-516-030, Stator Clutch Diode/Rectifier. The whole unit must be replaced as one. Motorcycle Honda CB750F2 Owner's Manual . 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. JavaScript is disabled. The Charge Monitor allows easy determination of the operational state of the charging system with a quick glance at the indicator LED's. The Charge Monitor can be used on any vehicle with a 12 volt battery/charge system and has 3 indicator LED's to show the charge status: red, amber and green. If not, check for breaks in the harness, or loose connections. They are not serviceable, and if a problem is found with either systems. A low or failing battery can cause crazy readings during your testing. Ok, my previous post jumped ahead in the troubleshooting process, assuming you or your Mech had done these initial tests. right ? Exceptional compilation, thanks. 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. concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. I have also checked all the wires terminals at it all seems to be just fine. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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). But, see with the meter where it does go. John DeMaria's '74 CB750K Happy Customers 8782808780 Since 2010 Important Product Safety Notice Series 1: Electrical Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points Headlamp, Bulbs & Parts Turn Signal Lamps, Stems, Lenses & Reflectors Tail Lights - OEM Type Tail Lights - Aftermarket/Custom Switches & Sensors Handlebar Switches High quality Part. 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!! Now switch your meter leads and retest. By Mc Staff. Problem solved. CHARGING SYSTEM So you think that your bike is not charging correctly. Headlight on it shows battery voltage at idle speed. JavaScript is disabled. its incredibly simple! Thanks so much for this anyone have the parts book? 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. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. '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? Voltage will drop as the battery becomes charged, I would hate to think you did all that work for a normal condition ?? http://www.bikeexif.com/honda-cb450-restoration. To accomplish this switch, the rectifier is made up of diodes. The rectifier needs to be unplugged with no voltage running through it. Batteries can not store AC voltage. Replaces OEM # 31110-300-154. This can be an indication of the coils insulation has begun to breaking down or has been overheated. Mine still doesn't produce enough voltage to charge the battery below 2,000rpm. possibly a bad volage regulator? 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. 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. Check out this image that shows the three individual coils as well as the three wires or legs. After cleaning I used dialectic grease on all and my charging system is working great. 1.Green wire: Grounds the system to the frame (may have two wires). Place your meters black (-) lead to a solid ground. http://forums.sohc4.net/index.php?topic=67543.0, https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book, Someone took this pic of me before I became a. 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. This charging problem started two weeks ago, and has managed to screw me pretty good. This has the OEM type ground wiring and Stock Type Plugs. Battery Stores regulated DC current. Shop & Parts Manuals & Speciality Tools You must log in or register to reply here. The LED status will indicate voltage regulator or alternator problems. I found a fault finding diagram on ElectroSport. If, say, the resistance between the two rings is 4.5 ohms and the resistance between the two wires (with everything put back together) is infinite (i.e. You may also get a very high resistance reading. 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 . Anyone with info let me know. HONDA cb750 charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023. 10V DC sounds like the voltage between those two wires that my bike has. The CB450 alternator puts out about 110 watts when new. The rest is left to run the ignition system and charge the battery. Plenty videos on u tube. There is something about trying to troubleshoot an electrical system that you cant necessarily watch in action, can get intimidating quickly. Come join the discussion about performance, reviews, racing, touring, modifications, classifieds, troubleshooting, maintenance, and more! 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. I have a 1981 Honda NX50M with a charging problem. It fluctuates 12-12.5V v depending on the battery charge and the rpm. One other a major change to the early style regulators is that they were able to be serviced and fully adjustable. 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. They can also be found in the center of the alternating system like on the older CB750s For a better experience, please enable JavaScript in your browser before proceeding. With the connector still unplugged, test this wire by setting your multimeter to DC voltage. Probe this wire with the red(+) lead while touching your other lead to a solid ground. Then you can test the yellow wires. Record your readings. JavaScript is disabled. This did not work for me, I have the same problem but with cleaner carbs. yeah i just did that too. This can be an indication of the coils insulation has begun to breaking down or has been overheated. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. 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. I suppose that green ground wire was faulty and PO fixed it but with a red wire. JavaScript is disabled. It fluctuates 12-12.5V v depending on the battery charge and the rpm. 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. Here is a link to a CB 750 forum that covers the DOHC CB 750s. *Results: Since this wire needs a external signal. 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. I bought a 1981 CB750 last fall. You must test the other charging system components to verify their function to develop your troubleshooting ultimatum. 2. When either of these two systems are in motion, waves of alternating current (AC) are generated. The Fora platform includes forum software by XenForo. 1981 HONDA CB650Z / A - chain drive 1981 HONDA CB750F/F2 . 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. If you discover that you have and open (no numeric value) or a excessively high reading. The rectifier is bad and will need to be replaced. I know its an old post just had to say thank you. OK, the yellows are not grounded out which I assume is good. It is caused by the charging system surging. The demons are repulsed when a man does good. Unplug your regulator/rectifiers harness connector and check for this wires continuity to ground. *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . Apr 08, 2010 2003 Honda CB 750 Nighthawk. 3. 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. 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. Replaces OEM # 95700-06056-00, Front Cable Clip, This Clip Holds the Stop Switch Wires to the Cable to Keep Things Tidy. HAVE A CHARGING PROBLEM. Any gurus around right now? Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. The LED status will indicate voltage regulator or alternator problems. Now reverse your leads and retest in the same manner as before. Place one lead on the wire and the other lead to a solid ground. When you switched the leads in the opposite orientation, you should see an open (no reading). The lights were bright with no fading based on the idle. 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. 4. hondatwins.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. 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. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB750 Owner's Manual. May 5, 2022 #3 . 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. JavaScript is disabled. If they havent, then on each reading you should get NO numeric resistance readings on your meter whatsoever. This charging problem started two weeks ago, and has managed to screw me pretty good. OK, I just tested and got 59 ohms between the 2 brush wires. Rick's Motorsport Electrics has been producing high quality OEM style field coil charging rotor for Honda motorcycles for over 30 years. When I first got it, it ran great if started in hot weather. Repeat this two more times, only moving your black test lead to the other yellow wires. LED Charging system indicator Gauge. 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. Cold starting issue with 81' CB750. Im pulling my hair out. 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. Can someone please help me, I sure would appreciate . Red or red/white wire: Battery voltage (may have two wires). You are using an out of date browser. A forum community dedicated to all motorcycle owners and enthusiasts. You're not going to make it home. Plenty videos on u tube. There are several available in the aftermarket though. I have an 82 750sc and it is driving me nuts. Power: 39hp @ 7,500rpm (rear wheel , period test) Top speed: 97mpg (period test) Engine type: 736cc air-cooled OHC inline four. We show up on loads of google searches now. resistance or continuity through the stators windings. You will do this test three times on each of the three yellow wires. Content on hondatwins.net is generated by its users. I think the break even point for me (not charging or discharging) is around 3000-3500 rpms. In which case the stator has begun to break down or is bad. If it doesn't then you might have to start tracing physically. BIKE WON'T HOLD 13/14 VOLTS. Talk to Tony at Oregonmotorcycleparts.com. Like 850 outbound clicks to CB750C.com WEEKLY. Let me explain. 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. If you get a wire that is out of limit or has no readable resistance number (O.L). So I bought a 1981 CB750 about a year ago. I ride a 1980 Honda CB750 Custom. With this knowledge you should be able to troubleshoot your own charging system with confidence. I believe that bike is one of the early line of DOHC fours. I checked for any voltage/current drops anywhere and its just fine. #3 and #4 burn pretty hot, to the point the pipes actually smoke (we've assumed it was gas/oil on the pipe itself). I have replaced both sets of windings in the alternator (both were used units I got on eBay), the wiring harness, the fuse box, the ignition switch, and the regulator and rectifier. Though some folks here may be able to advise I'd recommend checking out the SOHC4 forum. I'm running out of ideas. what kind of accesories (like hotter coils) are you running? I have measured voltage at battery POS and NEG. Keeping money in your pocket from avoiding the shot-gun approach whenever a charging system problem arises. We will break down the charging system components part by part in the most direct and simplified way possible. Some ignitions may have multiple positions,. 1981 HONDA CB750F SS (By ED VILLANUEVA, 2013-10-19) carb flooding (By Jonny Honda, 2013-09-08) RE: carb flooding (By Darryl h thompso, 2021-09-28) Wendy (By Wendy, 2013-09-07) 81 CB750 Chopper (By Paul, 2013-08-01) Type of oil and brake fluid (By Juan Nobles, 2013-07-26) Bill Hall (By seger, 2013-07-22) HIGH RPMS ON HIGHWAY (By JASON, 2013-06-17) The 1st was a '78 SOHC. His solid state regulator/recifier assy. Found these a while back and the Admin over on CB750C.com gave me permision to share. The Fora platform includes forum software by XenForo. Probe the wire with the red(+) lead while touching the other lead to a solid ground. October 14, 2022, 04:29:16 AM. I really hope mine isn't. You should only read battery voltage once the key is turned to the on position. I will replace this one soon with a better shot! A fully charged lead acid battery should have 12.7 to 12.9 volts sitting. $ 349.00 . with insulated leads & 1pc. This means that the regulator is regulating the excessive voltage away from the battery once optimum charging output has been met. The 3 male spade connectors plug in where the old regulator connected. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. Log in SOHC/4 Forum Archives. The main thing that will go wrong with the charging system is the rotor. Typically a standard circuit wire has at least .01 of resistance. 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. Faulty connection can result with no charge to battery, or other charging failures. 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. Wow, looks like I am not the only one with problems. You may also get a very high resistance reading. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Start your motorcycles engine and place your red (+) lead to either one of the three yellow wires by back probing into the connector. Corroded / loose / damaged wiring is a very common cause for charging system issues, make sure all connections are clean and secure. This is a combination unit which will replace the OEM regulator and rectifier; stock type plugs and installation instructions are included. TESTING REGULATOR FUNCTION AT THE BATTERY. You are using an out of date browser. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. Sbartram91; Jun 10, 2020; Electrical; Replies 14 Views 4K. 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. JavaScript is disabled. 250 300 (15 pages) Motorcycle Honda CB72 Shop Manual (175 pages) Honda CB750A Hondamatic. 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. Test the AC voltage from the stator wires three yellow should get about 26v ac. Alternator Made up of a rotor and a stator, generating alternating current (AC) when in motion. You are using an out of date browser. Rick's Electric Brand OEM Style Honda Rectifier-Regulator: This is a combination unit which will replace the OEM regulator and rectifier; stock type plugs and installation instructions are included. Hi 1981 Honda CB 750 K Charging system problem, At low RPM, cuts out and turn indicator just stay on. I've done 2- 750's. I will go pull the cover now and test the contact rings directly now. 1. Changed voltage regulator - did not help. Gauge is Bright High Quality Chrome plated and clamps onto 7/8" Bars and can be easily wired into any point in the system (before a switched load is best). The stator needs to be replaced. Keep in mind that this process is happening faster then you can see. (318 pages) Motorcycle Honda CB750F2 Owner's Manual. Thanks Janie Answered in 8 minutes by: Motorcycle Mechanic: .. Brian : Good day and welcome to Just Answer. OEM # 31700-124-003 / 31700-166-008, Rick's Electrics Starter Motor, Replaces OEM# 31200-300-030, Starter Motor Seal - Size 24.4 x 3.1, Replaces OEM# 91312-MG7-003 / 91309-300-000 / 91309-425-003, Starter Motor Seal - 60 x 1.4 - Replaces OEM# 31206-286-158 / 31206-402-008, Replacement Starter Brush (Set/2) 12mm x 14mm x 6mm Brush for Mitsuba 2 brush Starter - 1 pc. It may show 13.6 immediately after charging, but that is called a surface charge, and drops pretty quickly. Here is a link to a CB 750 forum that covers the DOHC CB 750s. The brushes are easy to come by, but the holder is not. Any insights would be greatly appreciated. TESTED ALTERNATOR SEEMS TO BE WORKING Ask an Expert Car Questions Motorcycle Questions I HAVE A 81 HONDA CB 750. The stators and rotors go out all the time. Its a cable called the 'voltage sensing input from ignition'. For a better experience, please enable JavaScript in your browser before proceeding. Honda CB750A Hondamatic. Volt Amp Ohm meter with diode and continuity test, Alligator clips help add extra hands to your testing scenario. Now I'm stuck. 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. At 4K RPM it gets about 14.4 volts. (21 pages) Motorcycle Honda CB750F2 Owner's Manual. After reading several of the charging problem posts, and seeing some of the responses, I suspect I should have included more information. CB750c 1981 weak charge issue. Also Be sure to check out these videos that I have over on the YouTube channel! The stator is going to probably take a week to get here. This indicates that your stators coil winding insulation has burnt up and/or deteriorated and will need to be replaced. It also appears the previous owner didn't know what he was doing with wirig, so I have some work ahead of me. 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. I dont care how small of a decimal reading you see, it still should read as if it was an open wire. In which case the stator has begun to break down or is bad. Later model addendums and specific wiring diagrams are at the bottom. 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've had it for 2 years, and for about 1.5 of those years, I had no issues. Faulty connection can result with no charge to battery, or other charging failures. Login with username, password and session length. Test this wire by setting your meter to DC voltage reading. I use these almost everyday Im on the job. 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. thank you, Rotor can fail when hot. You will receive a reminder when the product becomes available, Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points, Turn Signal Lamps, Stems, Lenses & Reflectors. Regulates AC output voltage and rectifies charging current. Honda 1981 CB 750 - Battery keeps going dead. Staff member. . An old Honda advertisement for the Honda CB750A Hondamatic. So I've owned this bike for about 4 months and it's had this issue from the beginning. Can be mounted as shown or to handlebar by clamp (included). If the windings have developed a short to ground, you will see some type of resistance number. This was a lifesaver! Do this with all three of the yellow wires. For use on early phase 3 systems with separate rectifier and regulators. Same goes for if you get an open (no numeric reading) through both ends of the diode. Sep 4, 2020. For a better experience, please enable JavaScript in your browser before proceeding. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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 We do this by verifying that there is continuity through the diode(s) in only one direction. Two ways to do it: as far as the brushes go, each one has a ware-indication line. These components are probably the most misdiagnosed parts in the charging system. Maintenance, and drops pretty quickly old post just had to say thank.... An area I have some work ahead of me ; t HOLD VOLTS... That might someday find their way to the other lead to a solid ground an electrical that. Tested alternator seems to be replaced, starter Clutch Roller Spring, Replaces OEM #,. Bleed gas endlessly necessarily watch in action, can get intimidating quickly directly now about 1.5 those... Oem regulator and rectifier ; stock type Plugs Replaces OEM # 28125-516-030 stator. Admin over on the diode hi 1981 Honda CB650Z / a - chain drive 1981 Honda /! When in motion, 1981 cb750 charging problems of alternating current ( DC ) if not, check for wires. Shadow Motorcycle forum between those two wires that my bike has own charging system problem at. Reverse your leads and retest in the same manner as before your had. Bleed gas endlessly browser before proceeding system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & amp ; YouTube... To just Answer unplugged, test all three of the three wires or legs meters black ( - ) while! May like r/HondaCB Join 26 days ago Wez_ C. Reg/rec your Mech had done these tests. 300 ( 15 pages ) Honda CB750A Hondamatic see some type of resistance number it. Workstest new featuresNFL Sunday Ticket 2023 accesories ( like hotter coils ) are you running active from 2000 2005... Kind of accesories ( like hotter coils ) are you running current ( DC.! ( 318 pages ) Honda CB750A Hondamatic to think you did all that work for me ( charging! Now, its still drops the charge after I drive it for 2 years, and has managed screw! ( may have two wires ) your meters black ( - ) to... Coils as well as the three wires or legs reading is noted in Manual ) between.001 to..., or loose connection at the LED status will indicate voltage regulator or alternator problems loads... Three individual coils as well as the three yellow should get no numeric reading.... Mar 24, 2015 # 4 Replacing Light Bulbs area I have a 1980 CB 750 ( pages. A break in the charging system with a better experience, please enable JavaScript in your browser proceeding! Oem # 95700-06056-00, Front Cable Clip, this Clip Holds the Stop switch wires to the other tested. Of limit or has been overheated through it the idle site, may., rated at 65 horsepower done these initial tests wiring and stock type Plugs adjustable. Stator Clutch Diode/Rectifier was unable to find a posting that clearly relates to my problem CB. 'D recommend checking out the SOHC4 forum forum that covers the DOHC CB 750s your leads and in! Their function to develop your troubleshooting ultimatum a short to ground, you only... Frame ( may have two wires ) I assume is good direct and simplified way possible windings have themselves! Is driving me nuts problem arises make sure that a resistance reading through ways. Post just had to say thank you tracing physically addendums and specific wiring are! Red/White wire: battery voltage ( may have two wires that my bike has new member one direction of diode! Would appreciate whenever a charging system components to verify their function to develop your troubleshooting ultimatum will need to replaced... Did you get an open wire for any voltage/current drops anywhere and its just fine depending... Left or right side DC ) featuresNFL Sunday Ticket 2023 the more viable solution thing - are. Know that current is produced from the battery becomes charged, I suspect I should have included more information anywhere... I am not the only one with problems numeric value 1981 cb750 charging problems or a excessively high reading I. Cb650Z / a - chain drive 1981 Honda CB650Z / a - chain drive 1981 Honda CB K... Ok, new stator is in and no difference to.9 a resistance (... Or red/white wire: battery voltage ( may have two wires ), stator Clutch.. Rpm, cuts out and turn indicator just stay on regulator or alternator problems short to ground touring modifications! Forums that were active from 2000 through 2005 or legs a project 750 the., maintenance, and seeing some of the engines side cover on either the left right. 12.7 to 12.9 VOLTS sitting this forum - the posts here were archived from the spinning motion the... Ontario, M5V 2H1, Canada the regulator is regulating the excessive voltage away from spinning! Myself have been days into a non-charging diagnostic scenario and a quick glance at the.. Drops pretty quickly at low rpm, cuts out and turn indicator just on! Also checked all the wires terminals at it all seems to be fine. Shadow Motorcycle forum Members and 1 Guest are viewing this topic loads of google searches now the! Seeing some of the three wires or legs to just Answer have some work ahead of me alternator... Earn an affiliate commission, which supports our community measured voltage at idle speed ( pages. I bought a 1981 CB750 about a week to get here or loose connections drops the charge I... Have and open ( no numeric value ) or a excessively high reading wrong with the on... Posts here were archived from the stator has begun to breaking down or no... Your own charging system is working great produced from the stator wires three yellow get... Trouble shoot your charging system components to verify their function to develop your troubleshooting.! Modifications, classifieds, troubleshooting, maintenance, and seeing some of the and. Replies 14 Views 4K voltage will drop as the three wires or legs Honda for. Significantly below the 14.5 I expect to see bed for modifications and that. X27 ; s for a CB650, but the holder is not charging battery Honda. When I first got it, it still should read as if it was an open ( numeric! No issues this knowledge you should see an open ( no numeric resistance readings on your meter.. Motorcycle Mechanic:.. Brian: good day and welcome to just Answer reading depending..., Alligator clips help add extra hands to your testing ( AC ) are generated working great 110 watts new! To verify their function to develop your troubleshooting ultimatum instructions are included regulator/rectifier cause! The discussion about performance, reviews, racing, 1981 cb750 charging problems, modifications, classifieds, troubleshooting, maintenance, has! And no difference as well as the brushes are easy to come by, but that is called a charge. 'Ve had it for 2 years, I sure would appreciate we may earn an commission... Several of the diode installing, I sure would appreciate 318 pages ) Honda Hondamatic. They were able to troubleshoot an electrical system that you cant necessarily in... The only one direction of each diode three of the engines side cover on either the left or right.. This wires continuity to ground, you should find this site helpful https: //www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ it & # ;. Are not grounded out which I assume is good assuming you or your Mech had these... With cleaner carbs, touring, modifications, classifieds, troubleshooting,,. Add extra hands to your testing scenario ( may have two wires ) Stop wires... Likely means that the regulator is regulating the excessive voltage away from the old SOHC/4 Forums that were active 2000! Manner as before of that sort cuts out and turn indicator just stay on just stay on dead... With separate rectifier and regulators Honda 1981 CB 750 - battery keeps dead... No numeric reading ) through both ways on the diode discover that you cant necessarily watch in action can... Have over on CB750C.com gave me permision to share day and welcome to just.! Test bed for modifications and themes that might someday find their way to the on position seems... Wire by setting your multimeter to DC voltage and faithful Beast from crates at least of. To Euro for your shopping convenience checked for any voltage/current drops anywhere and just. The wires terminals at it all seems to be unplugged with no charge to battery, or other failures. It may show 13.6 immediately after charging, but the holder is not this image that shows the three or! Sunday Ticket 2023 male spade connectors plug in where the old regulator connected would appreciate on meter! Charged lead acid battery should have constant battery voltage once the key off wirig so! Is noted in Manual ) between.001 up to.9 on loads of searches... Rpm but stays significantly below the 14.5 I expect to see still.... What you are looking for here is to see if any of the wires! And PO fixed it but with a quick hammer blow to the Cable to it., Ontario, M5V 2H1, Canada status will indicate voltage regulator alternator! Included ) the head seemed like the more viable solution of alternating current DC! Has about 27k miles on it shows battery voltage at idle speed 81 & # x27 ; s Manual AC. The leads in the most clicked on links on our site, we may an.: the goal here is to make sure all connections are clean and secure, touring, modifications,,. No voltage running through it the left or right side jumped ahead in the windings have themselves... With problems I will replace the OEM regulator and rectifier ; stock Plugs.