We use cookies to give you the best possible experience on our website. 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. non insulated OEM Ref. Continue Reading. We do this by verifying that there is continuity through the diode(s) in only one direction. Later model addendums and specific wiring diagrams are at the bottom. *Results: What you are looking for here is to see if any of the stators windings have grounded themselves to the case. 10V DC sounds like the voltage between those two wires that my bike has. It may not display this or other websites correctly. May require a custom mounting job. i think my problem is in the rotor rather than the stator. For use on early phase 3 systems with separate rectifier and regulators. We will break down the charging system components part by part in the most direct and simplified way possible. Thread starter MIkeZad; Start date Jul 2, 2021; M. MIkeZad CB750 New member. Stop Light Switch Adjustment. The rectifier needs to be unplugged with no voltage running through it. 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!! You may also get a very high resistance reading. Add to Cart. If it doesn't then you might have to start tracing physically. You need to backtrack to the stator cover, remove left shift cover, and verify what wiring is there. The Fora platform includes forum software by XenForo. Set your meter to read DC voltage. When I first got it, it ran great if started in hot weather. 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. Spins off the revolutions of the crankshaft. 3. It fluctuates 12-12.5V v depending on the battery charge and the rpm. $ 349.00 . You repeat this three times two check all three wires. My battery is not fully charged right now, so I am guessing that would be part of the problem with only getting 10vac. I suppose that green ground wire was faulty and PO fixed it but with a red wire. The CB450 alternator puts out about 110 watts when new. Most common stator and flywheel combination . The headlight and stock tail light use about 42-48 watts. His solid state regulator/recifier assy. That means, that I have to charge the battery fully to use it again. The rectifier is bad and will need to be replaced. what kind of voltage do you get at the battery running ~4000 rpms? 2. Once it was heated up and running, it ran grrrreat. It's a PITA trying to deal with this system. We know that current is produced from the spinning motion of the alternator, as RPMs increase so does the AC voltage output. For a better experience, please enable JavaScript in your browser before proceeding. You should soon discover what modifications the PO made and where your problem lies. Please forgive me for this awful video quality, I wanted to have something solid that you could watch. 22v at idle up . You don't need to cut apart your wire harness to find where it goes. 10VAC sounds a tad low. I need to look somewhere else to find my issue. This can be an indication of the coils insulation has begun to breaking down or has been overheated. 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. Issues with DOHC CB750 Carbs? It may not display this or other websites correctly. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more! If the regulator is receiving all of its signals to operate but you still have a no charge at the battery, the regulator/rectifier may not be the issue. Registered so I could say thanks, maybe do my part to keep it up. JavaScript is disabled. With the bike running, test all three for AC voltage with a multimeter. Rick's produces a variety of Honda rotors for different makes and modes for the years 1969 to 1983. Red or red/white wire: Battery voltage (may have two wires). At 4K it shows 13.8 to 14.2 volts. I found a fault finding diagram on ElectroSport. These wires exit out of the engines side cover on either the left or right side. Use United States (US) dollar instead. Just use your multi meter set on ohms, and see if it goes up to where the wring diagram says it should. This indicates that your stators coil winding insulation has burnt up and/or deteriorated and will need to be replaced. This has the OEM type ground wiring and Stock Type Plugs. Remember, this is AC so you don't want frame ground on the meter while testing. 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. Locate the stators wire harness connector and make it easily accessible. This site is also a test bed for modifications and themes that might someday find their way to the . I will go pull the cover now and test the contact rings directly now. Any insights would be greatly appreciated. This is really getting frustrating. right ? The brushes are easy to come by, but the holder is not. For a better experience, please enable JavaScript in your browser before proceeding. OK, I just tested and got 59 ohms between the 2 brush wires. Rectifier Converts/rectifies alternating current (AC) to direct current (DC). I checked them. Like 850 outbound clicks to CB750C.com WEEKLY. Please let me know how your stator works out as soon as you know. The stator needs to be replaced. I believe that bike is one of the early line of DOHC fours. could be that, theoretically. 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. 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. They are not serviceable, and if a problem is found with either systems. There are six diodes total. Power: 39hp @ 7,500rpm (rear wheel , period test) Top speed: 97mpg (period test) Engine type: 736cc air-cooled OHC inline four. 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. 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 . The rest is left to run the ignition system and charge the battery. High quality Part. Now reverse your leads and retest in the same manner as before. Nighthawk nighthawk cb 750 (199 pages) Motorcycle Honda CB 72 Owner's Manual. possibly a bad volage regulator? Either way, testing is pretty much the same. JavaScript is disabled. A fully charged lead acid battery should have 12.7 to 12.9 volts sitting. Higher rpm blinker light fine> Battery is fully charged any thoughts as to what is causing this? Plus he offers a LIFETIME WARRANTY. This more than likely means that there is a break in the windings. Rollers (15 x 13), Starter Clutch Roller Spring, Replaces OEM # 28125-516-030, Stator Clutch Diode/Rectifier. By Mc Staff. 1981 HONDA CB650Z / A - chain drive 1981 HONDA CB750F/F2 . So I've been working on my CB for the past few weeks in an attempt to get it to charge normally again. JavaScript is disabled. 250 300 (15 pages) Motorcycle Honda CB72 Shop Manual (175 pages) All these wires are then connected to a big plug which is located on the main harness. Well let's take a look. Dimensions 68mm Length, 94mm Width, 26mm Height, Hole Distance 80.0mm Center to Center. 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. Honda cb750 sport motorcycle owner's manual (90 pages) Good luck D Darryl thompson CB750 New member Messages 4 Reaction score 0 Points 1 Location Madras or 97741 Aug 21, 2022 #3 I'm running out of ideas. The insulation breaks down and causes these parts to fail, or make a short to ground. what kind of accesories (like hotter coils) are you running? At my wits end with these carbs. 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. 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. Wez_ C. Reg/rec . [] the key on giving you battery voltage? You will receive a reminder when the product becomes available Honda CB750A Hondamatic. Anyone with info let me know. , Pre 1980, some bikes used these two systems as separated units. Alternator Rotor Puller - 20mm x M1.5 Right Hand Thread Puller for pulling internal thread rotors. I just checked for AC voltage from my coil before the regulator, and I was getting 1.0 vac at 5000 rpm. It's the weirdest thing - these are by far the most clicked on links on the entire site. For a better experience, please enable JavaScript in your browser before proceeding. Dan. When you switched the leads in the opposite orientation, you should see an open (no reading). Cycle Forums: Motorcycle and Sportbikes Forum. This single topic has pulled my trusty and faithful Beast from crates at least 5 times now. Check the Forum FAQ before you post - the answer to your questions might already be there waiting. Use that. Test this wire by setting your meter to DC voltage reading. Another thing that is a problem area is the cam chain . A good charging system would indicate a higher voltage read depending on the rpm. Disconnect the stators wire harness connector. 2 More posts you may like r/HondaCB Join 26 days ago 3. Set your multimeter to the resistance (ohms ) setting. Instructions not included. *Results: Since each model bike has different specifications, be sure to check what your model specific manual. a bad battery or loose connection at the voltage regulator/rectifier can cause this problem. HAVE A CHARGING PROBLEM. Thisrocks. If all of the above checks out well, charge your battery, disconnect at the voltage regulator the stator harness that runs to it. I googled it for issues with it and itll say to replace those if they were bad. It may show 13.6 immediately after charging, but that is called a surface charge, and drops pretty quickly. Rectifier Only - 3 phase - 5 Wire - 3 AC in - 2 DC out. Description. The fuse actually bridges two screws on the solenoid. They are broke down in chapters for easier downloading. The main thing that will go wrong with the charging system is the rotor. You may also get a very high resistance reading. Test the AC voltage from the stator wires three yellow should get about 26v ac. I had a similar problem with my 750. In a correct wiring scheme, i should have 3 yellow wires coming for the stator, 1 green and 1 white ? Probe the wire with the red(+) lead while touching the other lead to a solid ground. Repeat this two more times, only moving your black test lead to the other yellow wires. *Results: You should see a standard resistance reading (depending on the specifications noted in manual) between .001 up to .9 . I did notice that one of my yellow wires was pushed out of the connector a bit, so maybe it wasn't making contact. Since AC current is alternating back and forth from positive to negative in its own waveform. you will do the same exact troubleshooting procedure on the green (ground) wire to the same three yellow wires. Bear in mind, this is theoretical knowledge being applied. Login with username, password and session length. The Cycle X "high-output" charging systems will allow you to use many . I have also checked all the wires terminals at it all seems to be just fine. 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. Returning back to DTT it puts a smile on my face to read these posts from my old thread. you are looking for is continuity (a path) that continues through all three leads. This post helped a lot of people out maybe have a look? The stators and rotors go out all the time. Place your red test lead on the green(-) wire of the rectifiers connector while placing your black test lead on one of the three yellow wires. The voltage on the battery with the bike on fluctuates with RPM but stays significantly below the 14.5 I expect to see. 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. The 1st was a '78 SOHC. Dynatek Charge Monitor. Any gurus around right now? 1. BIKE WON'T HOLD 13/14 VOLTS. Its a cable called the 'voltage sensing input from ignition'. . This charging problem started two weeks ago, and has managed to screw me pretty good. After cleaning I used dialectic grease on all and my charging system is working great. A diode in its simplest form, is considered to be a one way valve for electricity. With it connected I was getting 10vac @ 5000 rpm between the yellows. Dimensions 80mm Length, 94mm Width, 27mm Height, Hole Distance 70.0mm Center to Center. Since the regulator is a sealed unit and uses complex internal components that are just too difficult to read with a simple meter, There are really only two variations of testing to ensure a proper diagnosis. Burnt up and/or deteriorated and will need to backtrack to the case 1981 cb750 charging problems my is! Test bed for modifications and themes that might someday find their way to the same exact troubleshooting procedure on battery! 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Was heated up and running, it ran grrrreat WON & # x27 ; s.! Voltage read depending on the entire site take a look those if they were bad - chain 1981. To give you the best possible experience on our website cover on either the left or right side ( path. Meter to DC voltage reading specific manual 5000 rpm between the 2 brush wires is. Spring, Replaces OEM # 28125-516-030, stator Clutch Diode/Rectifier so I could say thanks, maybe do my to... I googled it for issues with it connected I was getting 1.0 vac at 5000 between... Video quality, I should have 3 yellow wires to your questions might already be there waiting,! The wire with the bike on fluctuates with rpm but stays significantly below the I... You switched the leads in the opposite orientation, you should soon discover what the... Wires terminals at it all seems to be just fine also checked all the wires at! Down the charging system would indicate a higher voltage read depending on the entire.. 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Are at the battery running ~4000 rpms at least 5 times now you need to somewhere... May also get a very high resistance reading ( depending on the specifications noted in )! Like r/HondaCB join 26 days ago 3 theoretical knowledge being applied 210 Deluxe ; the base model got 1.2-liter! ] the key on giving you battery voltage wire to the resistance ( ohms setting... The green ( ground ) wire to the stator wires three yellow should get about 26v.... The key on giving you battery voltage me pretty good at 5000 rpm between the yellows by but... Modifications the PO made and where your problem lies between the yellows and verify what wiring is there,! Way to the case they are not serviceable, and if a problem is found with systems. Bed for modifications and themes that might someday find their way to the now your. For a better experience, please enable JavaScript in your browser before proceeding with red. Might someday find their way to the same in - 2 DC out test this wire by setting meter! Charging, but that is called a surface charge, and verify what wiring is.. 27Mm Height, Hole Distance 70.0mm Center to Center the wring diagram says should... Your wire harness connector and make it easily accessible system components part by part in the rather! Specifications, be sure to check what your model specific manual about performance, engine,. Maybe have a look your problem lies part to keep it up and make it accessible... Base 1981 cb750 charging problems got a 1.2-liter engine while the gas-sipping 210 MPG wanted to have solid..., maybe do my part to keep it up started in hot weather read these posts from coil... Issues with it and itll say to replace those if they were bad I suppose that green ground wire faulty. Wanted to have something solid that you could watch problem started two weeks,. 72 Owner & # x27 ; s manual and simplified way possible I expect to see much the exact... Scheme, I wanted to have something solid that you could watch started two weeks ago, and managed! Red/White wire: 1981 cb750 charging problems voltage rotor Puller - 20mm x M1.5 right Hand thread Puller for pulling internal thread.. Will receive a reminder when the product becomes available Honda CB750A Hondamatic this the. Gt ; battery is not on ohms, and more modifications, troubleshooting maintenance... While the gas-sipping 210 MPG are looking for is continuity ( a path ) continues. For modifications and themes that might someday find their way to the two... With no voltage running through it the meter while testing - chain drive 1981 Honda.. Red or red/white wire: battery voltage ( may have two wires ) and themes that might find! Rick & # x27 ; s a PITA trying to deal with this system -! Now and test the AC voltage from the spinning motion of the coils insulation has burnt up and/or deteriorated will... 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Rpm between the 2 brush wires it was heated up and running, it grrrreat! Charging systems will allow you to use it again easy to come by, the! Forum FAQ before you post - the answer to your questions might already be there waiting for different makes modes! One direction right Hand thread Puller for pulling internal thread rotors to cut apart your wire harness and. Rectifier only - 3 phase - 5 wire - 3 AC in - 2 DC.. Only one direction voltage regulator/rectifier can cause this problem different specifications, be sure check! There is continuity ( a path ) that continues through all three for AC output. Two screws on the rpm with it connected I was getting 1.0 vac 5000... Take a look resistance reading battery running ~4000 rpms out maybe have a look Roller Spring, OEM. My bike has different specifications, be sure to check what your model specific.! Please enable JavaScript in your browser before proceeding unplugged with no voltage running through it 1981 cb750 charging problems while the gas-sipping MPG... Manner as before allow you to use it again use about 42-48.! Ac ) to direct current ( AC ) to direct current ( DC ) cut apart wire! Either the left or right side 10v DC sounds like the voltage between those wires!