I have measured voltage at battery POS and NEG. Anyone? 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. Thisrocks. Log in SOHC/4 Forum Archives. Its pretty crazy. Come join the discussion about performance, reviews, racing, touring, modifications, classifieds, troubleshooting, maintenance, and more! yes, that is correct, however be sure that you connect the other two wires, white and black. Im pulling my hair out. Anyone with info let me know. Place your Red meter lead to the red or red/white(+) wire, while placing your black lead to each of the yellow wires. CB750 New member. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Fuel on, any combination of carbs 2, 3, 4 will bleed gas endlessly. 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 Permanent magnets are used inside the walls of the common flywheel, spinning with the revolutions off the crankshaft and creating a magnetic field. *Results: What you are looking for is continuity (a path) that continues through all three leads. (30 pages) Motorcycle Honda CB750 Shop Manual. Ride Safely, Ed. 1.Green wire: Grounds the system to the frame (may have two wires). I've had it for 2 years, and for about 1.5 of those years, I had no issues. News: About this forum - The posts here were archived from the old SOHC/4 forums that were active from 2000 through 2005. You may also get a very high resistance reading. I'm running out of ideas. It may not display this or other websites correctly. You need to backtrack to the stator cover, remove left shift cover, and verify what wiring is there. Login with username, password and session length. High quality Part. Login with username, password and session length. This changes the AC wave to a direct (more controlled) voltage signal. This more than likely means that there is a break in the windings. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Your alternator has to pass AC voltage before the rectifier/regulator can do its work. This charging system can either utilize a permanent magnet or an electromagnet to help achieve its voltage output. Corroded / loose / damaged wiring is a very common cause for charging system issues, make sure all connections are clean and secure. 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. I am thinking maybe my brushes are bad because 1 is a lot more worn down then the other. Spins off the revolutions of the crankshaft. Keep in mind that this process is happening faster then you can see. 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. The fuse actually bridges two screws on the solenoid. Almost all reg/recs now-a-days are combined into one sealed unit. Common failure point for the charging systems of the DOHC bikes is the brushes or brush holders in the alternator. 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. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. This had all of my factory resources and more. 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. Plus he offers a LIFETIME WARRANTY. Issues with DOHC CB750 Carbs? 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. Description. Talk to Tony at Oregonmotorcycleparts.com. When you switched the leads in the opposite orientation, you should see an open (no reading). Red or red/white wire: Battery voltage (may have two wires). Anyway the DOHC CB 750s are known for really bad electrics. 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 . Read full answer. Good luck, old wiring sure is a treat. It may not display this or other websites correctly. Then you can test the yellow wires. Shop & Parts Manuals & Speciality Tools You must log in or register to reply here. 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 . 10VAC sounds a tad low. Can someone help me? Now I'm stuck. HONDA cb750 charging system explained - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new featuresNFL Sunday Ticket 2023. 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. A good charging system would indicate a higher voltage read depending on the rpm. 3 helpful . JavaScript is disabled. This charging problem started two weeks ago, and has managed to screw me pretty good. 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. Here is a link to a CB 750 forum that covers the DOHC CB 750s. This needs to be 12.5volts or above for accurate testing results These readings should be closely in range of each other. The LED status will indicate voltage regulator or alternator problems. I really hope mine isn't. Though some folks here may be able to advise I'd recommend checking out the SOHC4 forum. Probe this wire with the red(+) lead while touching your other lead to a solid ground. An old Honda advertisement for the Honda CB750A Hondamatic. To little charge will gradually kill your battery. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. 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. Repeat this two more times, only moving your black test lead to the other yellow wires. With the bike running at operating temperature. Rectifier Converts/rectifies alternating current (AC) to direct current (DC). 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. May require a custom mounting job. His solid state regulator/recifier assy. Your right about the holder. Black wire: Voltage detection wire (External voltage detection type on permanent magnet and exciter field type systems only). Dimensions 80mm Length, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center. Here is a video explaining this procedure. So, I have a 1980 CB 750 costume. 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. Now, its still drops the charge after I drive it for about a week. you are looking for is continuity (a path) that continues through all three leads. 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. 1. I need to look somewhere else to find my issue. 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. Set your multimeter to read resistance(). Plenty videos on u tube. 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. You don't need to cut apart your wire harness to find where it goes. when you replaced the one originally on your 750 did you get a new one? It is over charging and buring out all bulbs. Use that. The lights were bright with no fading based on the idle. Battery: This is a huge part of your charging system. . Check out this image that shows the three individual coils as well as the three wires or legs. Test this wire by setting your meter to DC voltage reading. 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. Thanks so much for this anyone have the parts book? 250 300 (15 pages) Motorcycle Honda CB72 Shop Manual (175 pages) At the first start, assuming it's set over about 4 hours it takes forever to start. I use one like this that gives you a Digital voltage read out. Most common stator and flywheel combination . Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. All three should indicate roughly the same amount of AC voltage. hondatwins.net is an independent Honda enthusiast website owned and operated by VerticalScope Inc. You repeat this three times two check all three wires. You're not going to make it home. Alternator Rotor Puller - 20mm x M1.5 Right Hand Thread Puller for pulling internal thread rotors. $ 349.00 . This was a lifesaver! You must log in or register to reply here. For a better experience, please enable JavaScript in your browser before proceeding. This post helped a lot of people out maybe have a look? . 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). The engine is the 1.5-liter A-series four-cylinder, rated at 65 horsepower. Honda cb750 sport motorcycle owner's manual (90 pages) 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. We use cookies to give you the best possible experience on our website. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. *Results: This wire should have constant battery voltage even with the key off. If you get a wire that is out of limit or has no readable resistance number (O.L). I checked for any voltage/current drops anywhere and its just fine. This means that the regulator is regulating the excessive voltage away from the battery once optimum charging output has been met. Check both over. - Honda CB 750 question. 1. I am thinking vacuum or gas but I am stumped. I believe that bike is one of the early line of DOHC fours. Welcome to SOHC/4 Forum Archives. For a better experience, please enable JavaScript in your browser before proceeding. . 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 ? The demons are repulsed when a man does good. . You will receive a reminder when the product becomes available, Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points, Turn Signal Lamps, Stems, Lenses & Reflectors. I had a similar problem with my 750. You will do this test three times on each of the three yellow wires. Place red(+) meter lead to battery positive terminal while placing the black(-) lead to the negative terminal of the battery and record your readings. Never been laid down or anything of that sort. Regulates AC output voltage and rectifies charging current. Alternator Made up of a rotor and a stator, generating alternating current (AC) when in motion. Thank you for your response Dan. 0 Members and 1 Guest are viewing this topic. R/R is only here to capture & regulate the alternator output. The rectifier needs to be unplugged with no voltage running through it. I had to do two roll-starts just to get it home. 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. Power: 39hp @ 7,500rpm (rear wheel , period test) Top speed: 97mpg (period test) Engine type: 736cc air-cooled OHC inline four. In which case the stator has begun to break down or is bad. 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. 13.5 amps and are prone to be even lower with old wires and poor connections. Regulator Regulates voltage so that it stays within the specified range. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. 3. Keeping money in your pocket from avoiding the shot-gun approach whenever a charging system problem arises. You should soon discover what modifications the PO made and where your problem lies. In a correct wiring scheme, i should have 3 yellow wires coming for the stator, 1 green and 1 white ? Generally anything below 8mm is an indication of a worn brush. 3. This charging problem started two weeks ago, and has managed to screw me pretty good. After installing, I had a constant voltage @ 14v. It allows voltage to pass through it but does not allow voltage to reverse its direction back the other way. 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. OK, the yellows are not grounded out which I assume is good. alternator not charging battery - Honda Shadow Forums : Shadow Motorcycle Forum. 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. Rectifier Only - 3 phase - 5 Wire - 3 AC in - 2 DC out. I will replace this one soon with a better shot! I've got a new set, but I may have to solder the dog legged one to make it work. Check the Forum FAQ before you post - the answer to your questions might already be there waiting. Found these a while back and the Admin over on CB750C.com gave me permision to share. I HAVE A 81 HONDA CB 750. how old is the battery? Staff member. JavaScript is disabled. 2. This is a combination unit which will replace the OEM regulator and rectifier; stock type plugs and installation instructions are included. Once it was heated up and running, it ran grrrreat. CHARGING SYSTEM So you think that your bike is not charging correctly. The headlight and stock tail light use about 42-48 watts. You do this by setting your meter to read resistance() and place your meter leads on the colored wires specified in the manual. Some ignitions may have multiple positions,. 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. . The Rectifier is no good, and cannot be fixed. Here is a link to a CB 750 forum that covers the DOHC CB 750s. You should only read battery voltage once the key is turned to the on position. It may not display this or other websites correctly. With it connected I was getting 10vac @ 5000 rpm between the yellows. Too much charge can cause overheating, meltdowns, explosions, and fires. Thanks. You may also get a very high resistance reading. As current increases, the regulator waits patiently for the battery to tell it, okay! 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. It may show 13.6 immediately after charging, but that is called a surface charge, and drops pretty quickly. 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. Once it comes in contact with this one way valve, the rectifier takes the negative wave portion, and flips it into a positive wave. Good luck D Darryl thompson CB750 New member Messages 4 Reaction score 0 Points 1 Location Madras or 97741 Aug 21, 2022 #3 Black meter lead to the green(-) wire while placing your red test lead to the yellow wires one at a time. We show up on loads of google searches now. (21 pages) Motorcycle Honda CB750F2 Owner's Manual. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. I use these almost everyday Im on the job. HAVE A CHARGING PROBLEM. .It has been doing that ever since. The 1st was a '78 SOHC. For Honda, the wires are ALWAYS YELLOW in color. Set your multimeter to the resistance (ohms ) setting. October 14, 2022, 04:29:16 AM. Tested continuity of this wire with the frame and it has continuity with ground. Charging System/Alternator: Service Information, Troubleshooting 155; Related Manuals for Honda CB750F2. There is a very effective way to see if your battery has any excessive draw on it while the key is off. All these wires are then connected to a big plug which is located on the main harness. The stator needs to be replaced. There are six diodes total. Instructions not included. Honda CB750A Hondamatic. Rollers (15 x 13), Starter Clutch Roller Spring, Replaces OEM # 28125-516-030, Stator Clutch Diode/Rectifier. Add to Cart. Hello, my name is Edgar, How are you all doing? 2. Motorcycle Honda Nighthawk CB 750 1991 Service Manual. A low or failing battery can cause crazy readings during your testing. This NEEDS to be correctly charged and tested before you start and troubleshooting. The Cycle X "high-output" charging systems will allow you to use many . you will do the same exact troubleshooting procedure on the green (ground) wire to the same three yellow wires. That means, that I have to charge the battery fully to use it again. right ? Submit. I have a 1981 Honda NX50M with a charging problem. I bought a 1981 CB750 last fall. 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. Besides the dog, the test light is a mans best friend. For a better experience, please enable JavaScript in your browser before proceeding. They are broke down in chapters for easier downloading.

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