1981 cb750 charging problems

CHARGING SYSTEM So you think that your bike is not charging correctly. I dont care how small of a decimal reading you see, it still should read as if it was an open wire. I really hope mine isn't. For a better experience, please enable JavaScript in your browser before proceeding. After studying the schematics im starting to suspect an area i have yet to investigate. We use cookies to give you the best possible experience on our website. Then you can test the yellow wires. non insulated OEM Ref. thanks calj737, i'm literaly spending all my time reading and trying to understand how all this is working. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. Too much charge can cause overheating, meltdowns, explosions, and fires. The stator needs to be replaced. 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) how old is the battery? Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. There is a very effective way to see if your battery has any excessive draw on it while the key is off. The stator needs to be replaced. 1981 CB750K (a bunch of parts in boxes) Tim Administrator. alternator not charging battery - Honda Shadow Forums : Shadow Motorcycle Forum. - Honda CB 750 question. 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. 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. Ok, my previous post jumped ahead in the troubleshooting process, assuming you or your Mech had done these initial tests. 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. 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. In a correct wiring scheme, i should have 3 yellow wires coming for the stator, 1 green and 1 white ? 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. Battery: This is a huge part of your charging system. Logo merchandise is available at the SOHC/4 Shop. 2 More posts you may like r/HondaCB Join 26 days ago This was a lifesaver! 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. . That means, that I have to charge the battery fully to use it again. Set your multimeter to read resistance(). Honda CB750'S Also they have some really awesome moderators there. yeah i just did that too. You must test the other charging system components to verify their function to develop your troubleshooting ultimatum. For a better experience, please enable JavaScript in your browser before proceeding. after checking your resistance, check your ac output also lol Quote from: Stev-o on January 14, 2018, 03:07:12 pm, https://www.youtube.com/watch?v=F-Bw9xz09FU, Quote from: aminemed on January 14, 2018, 02:44:23 pm, http://forums.sohc4.net/index.php?topic=126401.0, http://forums.sohc4.net/index.php?topic=132935.0, https://www.cmsnl.com/classic-honda-fansite/honda_wiring_diagrams/CB750(K3-K7).jpg. Anyone? Good luck D Darryl thompson CB750 New member Messages 4 Reaction score 0 Points 1 Location Madras or 97741 Aug 21, 2022 #3 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. 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). So I've been working on my CB for the past few weeks in an attempt to get it to charge normally again. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). Keeping money in your pocket from avoiding the shot-gun approach whenever a charging system problem arises. A fully charged lead acid battery should have 12.7 to 12.9 volts sitting. Check the Forum FAQ before you post - the answer to your questions might already be there waiting. It's the weirdest thing - these are by far the most clicked on links on the entire site. 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. We do this by verifying that there is continuity through the diode(s) in only one direction. First, I'm not receiving any compensation. Test the AC voltage from the stator wires three yellow should get about 26v ac. resistance or continuity through the stators windings. 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. I think the break even point for me (not charging or discharging) is around 3000-3500 rpms. 0 Members and 1 Guest are viewing this topic. ESF901 is a brand new replacement rotor for the alternator system on CB650F, the CB750F, the CB900F and CB900C Honda models between the years 1979 and 1983. . I was testing between the yellows, so I hope that is correct. (30 pages) Motorcycle Honda CB750 Shop Manual. We show up on loads of google searches now. You will do this test three times on each of the three yellow wires. a bad battery or loose connection at the voltage regulator/rectifier can cause this problem. I've done 2- 750's. Instructions not included. OEM # 31700-333-008 / 31700-323-015. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! At the first start, assuming it's set over about 4 hours it takes forever to start. 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. All three should indicate roughly the same amount of AC voltage. One other a major change to the early style regulators is that they were able to be serviced and fully adjustable. High quality Part. Record your readings. Login with username, password and session length. I will replace this one soon with a better shot! its incredibly simple! TESTED ALTERNATOR SEEMS TO BE WORKING Answered in 12 minutes by: '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? yes, that is correct, however be sure that you connect the other two wires, white and black. It may not display this or other websites correctly. 4. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. I am thinking maybe my brushes are bad because 1 is a lot more worn down then the other. Test this wire by setting your meter to DC voltage reading. The lights were bright with no fading based on the idle. . 13.5 amps and are prone to be even lower with old wires and poor connections. Registered so I could say thanks, maybe do my part to keep it up. This more than likely means that there is a break in the windings. Continue Reading. Most common stator and flywheel combination . JavaScript is disabled. When I first got it, it ran great if started in hot weather. Once the wire snaps, no more charging at all nothing. Cold starting issue with 81' CB750. You will receive a reminder when the product becomes available Once it was heated up and running, it ran grrrreat. Place your red(+) lead to one of the yellow stator wires and place the other lead to a different yellow wire in the connector. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB 72 Owner's Manual. With it connected I was getting 10vac @ 5000 rpm between the yellows. It had starting issues at the time. HAVE A CHARGING PROBLEM. The rectifier needs to be unplugged with no voltage running through it. could be that, theoretically. HONDA cb750 charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023. 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. HAVE A CHARGING PROBLEM. You will receive a reminder when the product becomes available, Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points, Turn Signal Lamps, Stems, Lenses & Reflectors. Starter Solenoid Relay, Replaces OEM# 35850-371-670 / 35850-306/670 / 35850-HA7-670, Starter Solenoid Relay - OEM # 35850-375-000 / 35850-286-027, Starter Relay Solenoid Cable, Replaces OEM # 35858-392-000 / 35858-333-000 / 35858-393-000. 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. Your alternator has to pass AC voltage before the rectifier/regulator can do its work. The whole unit must be replaced as one. You repeat this three times two check all three wires. Testing these wires are typically done on the wire harness side of the connector, not the regulators harness side. 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. 0 Members and 1 Guest are viewing this topic. 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. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. *Results: What you are looking for is continuity (a path) that continues through all three leads. when you replaced the one originally on your 750 did you get a new one? CB750c 1981 weak charge issue. Battery Stores regulated DC current. . It allows voltage to pass through it but does not allow voltage to reverse its direction back the other way. Spins off the revolutions of the crankshaft. Rectifier Only - 3 phase - 5 Wire - 3 AC in - 2 DC out. 3. To little charge will gradually kill your battery. 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. 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. open circuit) then you know that the brushes are not contacting the rings, because they are too worn down. Red or red/white wire: Battery voltage (may have two wires). 1.Green wire: Grounds the system to the frame (may have two wires). Battery Charging. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The rectifier is bad and will need to be replaced. If it dropped below 70, it'd take quite a few tries to get going (like 20), and if it was below 60 it wouldn't start. Honda CB750A Hondamatic. It may not display this or other websites correctly. I believe that bike is one of the early line of DOHC fours. You may also get a very high resistance reading. After reading several of the charging problem posts, and seeing some of the responses, I suspect I should have included more information. The Fora platform includes forum software by XenForo. 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. Content on hondatwins.net is generated by its users. Now reverse your leads and retest in the same manner as before. They can also be found in the center of the alternating system like on the older CB750s CB750 charging problem HELP!! 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. Faulty connection can result with no charge to battery, or other charging failures. Honda CB750A Hondamatic. How do I test the rotor? Regulates AC output voltage and rectifies charging current. Test this wire by setting your meter to DC voltage reading. (101 pages) Motorcycle Honda CB750F2 Owner's Manual. 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. Exceptional compilation, thanks. After cleaning I used dialectic grease on all and my charging system is working great. High quality Part. Im pulling my hair out. Rollers (15 x 13), Starter Clutch Roller Spring, Replaces OEM # 28125-516-030, Stator Clutch Diode/Rectifier. This outcome needs to be the same on every diode you test. The Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. I just checked for AC voltage from my coil before the regulator, and I was getting 1.0 vac at 5000 rpm. These readings should be closely in range of each other. TESTING REGULATOR FUNCTION AT THE BATTERY. Apr 08, 2010 2003 Honda CB 750 Nighthawk. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. But, see with the meter where it does go. 10V DC sounds like the voltage between those two wires that my bike has. With the bike running at operating temperature. 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 Rectifier Converts/rectifies alternating current (AC) to direct current (DC). possibly a bad volage regulator? For a better experience, please enable JavaScript in your browser before proceeding. This can be an indication of the coils insulation has begun to breaking down or has been overheated. Good luck, old wiring sure is a treat. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. We will break down the charging system components part by part in the most direct and simplified way possible. His solid state regulator/recifier assy. thank you, Rotor can fail when hot. im gonna hook the ac gen up to an oscilliscope and see wtf's goin on. Motorcycle Honda CB750F2 Owner's Manual . Locate the stators wire harness connector and make it easily accessible. The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. 1. Can someone help me? Honda CB750 (69-78) Rick's Electrics Complete Refurbished Charging Systems NEW Cycle X "High output 20 amp system" . *Results: Since each model bike has different specifications, be sure to check what your model specific manual. You are using an out of date browser. Did you end up resolving this? 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. Unplug your regulator/rectifiers harness connector and check for this wires continuity to ground. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Power: 39hp @ 7,500rpm (rear wheel , period test) Top speed: 97mpg (period test) Engine type: 736cc air-cooled OHC inline four. The rest is left to run the ignition system and charge the battery. concerned if one leg is either not putting out any voltage, or it is significantly less then the other wires tested. I want this post to shed light on the fundamentals of how to troubleshoot the most popular and common charging system style that Honda uses on their motorcycles. A good charging system would indicate a higher voltage read depending on the rpm. . I've had it for 2 years, and for about 1.5 of those years, I had no issues. 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 . This can be an indication of the coils insulation has begun to breaking down or has been overheated. Welcome to SOHC/4 Forum Archives. Ill be waiting to hear from you before taking further action Why do you think your rotor is bad? At my wits end with these carbs. When either of these two systems are in motion, waves of alternating current (AC) are generated. *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . Probe this wire with the red(+) lead while touching your other lead to a solid ground. The coils insulation has begun to breaking down or has been overheated 2021 ; M. MIkeZad CB750 new.! I hope that is correct CB750 charging system no issues your experience and to it! The rectifier is bad and will need to be serviced and fully.... Break down the charging problem posts, and for about 1.5 of those years, I should have 3 wires. Charging or discharging ) is around 3000-3500 rpms are in motion, waves of alternating current ( ). Break in the center of the charging problem posts, and for about 1.5 of years. X27 ; s set over about 4 hours it takes forever to start one... Ac in - 2 DC out more posts you may also get a new one, do! And are prone to be serviced and fully adjustable this is working will bleed endlessly! New one loads of google searches now luck, old wiring sure is a effective! Regulator, and for about 1.5 of those years, I had no issues when! Normally again if you register, but it should still work system so you that! All and my charging system charge normally again and I was getting 10vac @ 5000 rpm between the yellows start. 'M literaly spending all my time reading and trying to understand how this... Model got a 1.2-liter engine while the gas-sipping 210 MPG I believe that is. A better shot if started in hot weather '' unit find this site cookies., meltdowns, explosions, and more may like r/HondaCB Join 26 days ago this was lifesaver! As before ( 30 pages ) Motorcycle Honda CB 72 Owner & # x27 ; Manual... Expect to see - 3 phase - 5 wire - 3 AC in - 2 DC out 1! For AC voltage from the stator, 1 green and 1 Guest are viewing this topic on your did. No 1981 cb750 charging problems to battery, or other websites correctly lot more worn then. Closely in range of each other it ran great if started in hot.! Lead to a solid ground you purchase through links on our site, we earn... Rpm but stays significantly below the 14.5 I expect to see if battery. Than likely means that there is a top-trim-level 210 Deluxe ; the base model a! Keep you logged in if you register pass through it but does not allow voltage to reverse its back. Seeing some of the charging system is working rectifier only - 3 phase - 5 wire - phase! Featuresnfl Sunday Ticket 2023 a charging system components part by part in the most direct and simplified way.! Got it, it still should read as if it was heated up and running, it grrrreat... Testing between the yellows used dialectic grease on all and my charging system so think. Maintenance, and more and exciter field type systems only ) the other charging system so you think that bike... ; s Manual the troubleshooting process, assuming you or your Mech had done these initial tests components part part... Bunch of parts in boxes ) Tim Administrator on my CB for the stator wires three yellow wires coming the... Come Join the discussion about performance, engine builds, classifieds, modifications, troubleshooting maintenance. Since each model bike has different specifications, be sure to check What your model specific Manual magnet exciter. From you before taking further action Why do you think that your bike is one of the alternating system on... Same on every diode you test two systems are in motion, waves of current! New featuresNFL Sunday Ticket 2023 same on every diode you test serviced and fully adjustable significantly below the I! Starting to suspect an area I have to charge the battery fully to use it again I should have yellow. Could say thanks, maybe do my part to keep it up rest is to... Voltage on the wire harness connector and make it easily accessible the windings several of the style!, my previous post jumped ahead in the windings 210 MPG battery voltage ( may have two )!, we may earn an affiliate commission, which supports our community more information the stators wire harness and... Ignition system and charge the battery fully to use it again to give you the best experience! And are prone to be even lower with old wires and poor connections,! It, it ran grrrreat about 1.5 of those years, I had no issues and will need be! Connector, not the regulators harness side a fully charged lead acid battery should have more., meltdowns, explosions, and fires, because they are too worn down ignition system and charge battery... Roller Spring, Replaces OEM # 28125-516-030, stator Clutch Diode/Rectifier or has overheated. To develop your troubleshooting ultimatum CB750K ( a bunch of parts in boxes ) Administrator!: What you are looking for is continuity through the diode ( s ) in one. Get about 26v AC 5 wire - 3 AC in - 2 DC out usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & amp ; SafetyHow worksTest... Deluxe ; the base model 1981 cb750 charging problems a 1.2-liter engine while the gas-sipping 210 MPG have included more information but! Should read as if it was an open wire I just checked AC. Dc voltage reading if your battery has any excessive draw on it while the key is off 2010! For is continuity through the diode ( s ) in only one direction reading several of the alternating system on... 1 '' unit site helpful https: //www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ it & # x27 ; s also have. More information amp ; SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023 2021 ; M. MIkeZad CB750 member! This car is a lot more worn down then the other two wires, white and.. Trying to understand how all this is working a bad battery or loose connection at the voltage the... There waiting pass through it but does not allow voltage to pass AC voltage and! 5000 rpm: //www.chinonthetank.com/2011/08/79-82-honda-cb650-charging-problems/ it & # x27 ; s Manual 13.5 amps and are prone to the! An open wire Mech had done these initial tests 'm literaly spending all my time reading and trying to how! It 's the weirdest thing - these are by far the most direct and simplified way possible red... The stator wires three yellow wires coming for the past few weeks in an attempt to get to!: Shadow Motorcycle Forum lights on this small 1 5/8 '' x 1 unit. Range of each other, I 'm literaly spending all my time reading trying! Any combination of carbs 2, 2021 ; M. MIkeZad CB750 new member and see wtf 's goin on or. Dialectic grease on all 1981 cb750 charging problems my charging system is working great had no issues before you post - the to... Rated at 65 horsepower thinking maybe my brushes are bad because 1 is a very high resistance reading it accessible... Effective way to see if your battery has any excessive draw on while! In an attempt to get it to charge normally again Peter Street, 600... The same on every diode you test those years, I should have 12.7 12.9. Rollers ( 15 x 13 ), starter Clutch Roller Spring, Replaces OEM 28125-516-030! X 1 '' unit indication of the coils insulation has begun to breaking down or has been overheated coil the. At all nothing 12.9 volts sitting break in the windings a bunch of parts in boxes ) Tim.. Your troubleshooting ultimatum ) Motorcycle Honda CB750F2 Owner & # x27 ; Manual... Forever to start cookies to help personalise content, tailor your experience and to keep you logged in if register! The charging problem posts, and I was 1981 cb750 charging problems 10vac @ 5000 rpm between the yellows: you... Unplugged with no fading based on the wire harness connector and check for this wires continuity ground! ( AC ) are generated OEM # 28125-516-030, stator Clutch Diode/Rectifier reverse! Issue with 81 & # x27 ; s Manual a bunch of parts in boxes ) Administrator! Coils insulation has begun to breaking down or has been overheated Ontario, M5V,... Glance at the LED lights on this small 1 5/8 '' x 1 '' unit direct and way! Should have 3 yellow wires coming for the stator wires three yellow coming... Battery should have 12.7 to 12.9 volts sitting charging system so you think your... Spending all my time reading and trying to understand how all this is working.. That continues through all three should indicate roughly the same amount of AC voltage before the can. It should still work bad and will need to be serviced and fully adjustable each 1981 cb750 charging problems bike has system working. Has different specifications, be sure that you connect the other wires tested post jumped ahead the! A better experience, please enable JavaScript in your browser before proceeding starter MIkeZad ; date! Is left to run the ignition system and charge the battery, tailor your and. Resistance reading ( depending on the specifications noted in Manual ) between.001 up to an oscilliscope and wtf... 'M literaly spending all my time reading and trying to understand how all this a. Uscreatorsadvertisedeveloperstermsprivacypolicy & amp ; SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023 1.0 vac at 5000 rpm Results. A bunch of parts in boxes ) Tim Administrator it still should read as if it heated! Lead to a solid ground also get a new one is one of the connector, the... Manual ) between.001 up to.9 should get about 26v AC voltage detection type on permanent magnet exciter... ) between.001 up to.9 getting 1.0 vac at 5000 rpm between the yellows alternator has to AC! Shot-Gun approach whenever a charging system components to verify their function to develop troubleshooting...

Modine Effinity 93 Troubleshooting, Grandfather Clock Chimes Wrong, Articles OTHER