cb750 voltage regulator test

Fire up the bike and let it warm up, a little. Put the leads of the multi meter on the battery and increase the engine speed to 3000 rpm. 3 yellows from the stator, 1 to the batt + and 1 to batt -(or chassis ground) is how it should be, just like the cbr. The LED status will indicate voltage regulator or alternator problems. Got it figured out! And it worked but I guess I'll have to update to solid state regulator. Now repeat the charge amps test, but this time, DO NOT EXCEED 3000 RPM, the voltage could go dangerously high. ", http://forums.sohc4.net/index.php?topic=68952.0, http://www.xl250k3.com/library/Honda-Electrical-Manual.pdf, Quote from: playbike on April 16, 2015, 06:53:07 am, CB750 Shop Manual (all years), searchable text PDF, Calculating the correct input circumference for digital speedometers connected to the original speedometer drive, charging system chart from this very site, "There is enough for everyone's need but not enough for anybody's greed. My '75 isn't charging. It's definitely a fine balancing act. The rectifier actually converts the power from AC to DC, while the regulator keeps the power level (voltage) from going above the 13.8 -14.5 volts needed to power a standard 12 volt battery. Measure the battery’s specific gravity as described in Chapter Three. + pos to starter and - to ground. It needs that load ( amperage ) passing thru' the reg. My question above was ment how does a conventional or H4 lamp react when the engine is revved. I had the same issue. The regulator contacts are not visibly pitted/corroded. CB750 Voltage Regulator Adjustment.jpg (659.04 kB, 1873x2061 - viewed 44 times.) Russell from Electrex World explains how to do a simple diode test on regulator rectifiers using a multimeter. I ride it and work on it to minimize down time. Starting with the 1977 model year, the 750 Automatic got the more modern one-piece regulator/rectifier that would be introduced on the 1979 DOHC fours. the CB750 automatic. you … $59.99 + $6.99 Shipping. 0 Members and 1 Guest are viewing this topic. Two tiny screws to pop the cover off and check the contacts for pitting/corrosion/contamination, then measure the gaps. Yep. how do i test voltage regulator on a cb750 k? Login with username, password and session length. The regulator on the XS650 works by turning the rotor current on and off very rapidly in response to the voltage on the brown wire. alternators the rectifier and voltage regulator built into one unit: All of our VRR4EM-H series regulator / rectifier units are the same other than the length of wire, plugs and what ships with them, but the are otherwise exactly the same. Thanks for your replies! Logged "A ship in harbor is safe, but that is not what ships are built for." CB750.com is dedicated to the Honda CB750 SOHC and DOHC motorcycles and to their owners who love to ride, ... What kind of A/C voltage readings did you observe? Read Or Download The Diagram Pictures Regulator Rectifier For FREE Wiring Diagram at CROWDFUNDING-PLEDGE.DEMO.AGRIYA.COM b. T with Connect 12V batteries resistor with a Son in Test go out when 14—1 SV by the RECTIFIER GENERATOR REGULATOR BATTERY,'CHARGING SYSTEM GREEN WHITE BLACK RESISTOR son rwo FULLY CHARGED BATTERIES … Free shipping for many products! ... Don't even need a rectifier or regulator to test that. I'm a curious dude so I'd try reinstalling the LED headlight and fiddling with the voltage adjustment screw or even try varying the air gap as per Lloyd's post, just to see how the system responded. There are a few guys out there who still use these components, but there are plenty of more modern solid state regulator/rectifier combo units … Get a multi meter and instructions for its use. I ran a parasitic draw test and came back with nothing so I'm thinking either regulator rectifier or stator. The load was so much smaller, 15W vs. 55W, that charging voltage jumped up and down. Charging voltage of my CB750 K2 is jumping from 12V to 15V, measured from the battery terminals. Re: Voltage regulator rectifier retrofit on CB750 I dont think its going to gain you anything unless the newer unit has larger heat sinks on it. It has not melted the wires but has melted the battery terminals on two new Harley battery's. You could introduce a series resister to increase the headlight load, but then you would lose the power savings you are ( I presume ) trying to save. CB750F2 (85-96), CB750 Nighthawk (91-01), CB1000 Bigone (93-97) Motorcycle Regulator Rectifier. it also has a little magnet so you can put it on a tank, I believe that for the alternator you have to be atleast above 2,000 rpm's to get the charging system to work. You are bidding on the voltage regulator for a 1976 Honda CB750K.See description for condition. Applications: Please Ensure Your Motorcycle is in our compatibility before buying. My opinion is that the charging system and regulator are fine.....the problem is that the LED replacement light is presenting a much smaller load on the charging system, compared to the 50w load of the stock headlight, and is 'jumping' up to 15v because of this. ... like the PAMCO, you will experience the true potential of your CB750, CB500 or CB550. I have a 1975 Honda CB750. If this test shows continuity to ground, then the unit is bad. Add 40 years of heat, weather and previous owners wiring hacks and no wonder the battery on your bike is always dead. So my battery isn't getting any charge (<12.5 above 3k rpm). 1 Answer. Everything I can find lists the cb750 as a 5 wire unit reg/rec. Does it 'jump' too when it becomes brighter or gradually? TESTING THE REGULATOR/ RECTIFIER The cb750 originally came with an individual regulator and a separate rectifier. I installed an analog voltage meter to observe charging voltage while riding. I have opened up the regulator a few years ago and I can't remember if those points were misaligned then. The contact points are misaligned by half of their diameter.. This regulator was used on virtually all Chrysler products from 1970 to … Sorry, forgot to mention that I have done exactly what you recommended. Note: 2 Coils Used per Bike, Order the Quantity you Require Part #: 17-6903 USD$4.95 Set ... electrical fault finding and practical testing and test equipment. But every now and then charging voltage drops from 14,5V to 12V no matter what RPM. I don't think even with the reduced load that there should be such a dramatic double-peak in the voltage. Replaces OEM Part: 31400-292-670, 31700 … None of the yellow wires are shorting to ground. The first dynamic test allows you to check the rotor that contains the magnets and spins around the stator. Part of what concerned me about the description of the symptoms is the fact that as RPM rose, the voltage would increase to max, then fall to min, then rise back to max again. Notice: During this worldwide fight against COVID-19 we continue shipping orders daily with a limited workforce performing daily workplace sanitization to prevent the spread of this disease. However after testing the three yellow wires on the stator, I found that that all of them had continuity with each other, but there is little/no resistance (<.000 ohms). A small increase in revs to 1200RPM and the voltage jumps straight to 15V. ... electrical fault finding and practical testing and test equipment. Put back my old halogen and everything works great. Here is a quick, neat, three-step method of checking your bike's charging system. If your sure it's a carb problem; it's ignition. Relevance. https://www.motorcycleproject.com/text/regul_adjust_750.html The proper connection for a coil is that the voltage from the ignition switch goes to coil (+). Culprit was the LED bulb. I have a multimeter but I'll go to the storte today and get the one recommend and give it a try. Anonymous. Favorite Answer. Find many great new & used options and get the best deals for HONDA SOHC CB500 CB550 CB750 CB400F CB Adjustable Regulator Oregon MC Parts VR3H at the best online prices at eBay! regulator/rectifier. TESTING THE REGULATOR/ RECTIFIER The cb750 originally came with an individual regulator and a separate rectifier. Anonymous. Honda Rectifier / Regulator CB500 / CB550F / CB550K | Common … Buy Mosfet Voltage Regulator Rectifier For Honda CB650 CB750 CB900 Nighthawk K Limited Custom CB750F CB900F F CBX1000 Super Sport CB1000 CB1100 CB CBX 650 750 900 1000 1100 1979-1985 Repl.#31600-425-008: Rectifiers - Amazon.com FREE DELIVERY possible on eligible purchases It's obvious that this cutting of voltage happens when regulator switches to high resistance circuit. Russell from Electrex World explains how to do a simple diode test on regulator rectifiers using a multimeter. I am committed to providing you a good usable part. Hi! 4. The bike left me stranded a couple weeks ago, I was able to kick start it and get home which was cool. There are tests to check the A/C voltage output of the coil that will help eliminate the regulator and/or rectifier as the source of the problem. Voltage Regulator. with the h/l off, but then introduce a LED h/l load and the reg. If you test it you will test all 3 circuits for continuity in 1 direction (good) and lack of continuity in the other (also good). This caused the regulator to switch circuit too early and too eagerly. Rectifier Regulator for Motorcycle / ATV / off-road / watercraft / snowmobile Choose Year 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 … + pos to starter and - to ground. Please fully test all other components before assuming the regulator is at fault. Any ideas woould be great. Sounds like a problem with the regulator itself. It is important that the stator provides more power than needed by the motorcycle so that the battery will stay charged. To obtain accurate test results, the battery must be fully charged with a specific gravity reading above 1.270. The rectifier actually converts the power from AC to DC, while the regulator keeps the power level (voltage) from going above the 13.8 -14.5 volts needed to power a standard 12 volt battery. R255a rectifier for 1969~1978 SOHC in-line four cylinder Hondas $5 1.00 R255a-H ... separate rectifier and voltage regulator. Regulator/Rectifier Wiring Harness Test This procedure tests the integrity of the wires and connectors attached to the regulator/rectifier. If there's less load on the system, wouldn't the regulator try to drop into "do not charge" mode instead of "charge as much as possible" mode? Any problems with the rotor will cause a loss of output. Go to the auto parts store like advanced auto, or auto zone (i got mine at advanced) and go by all the testers and there will be a little tester thats 1 inch by about 7 inches and it has a positive lead and a negitave lead, it test battery volts and alternator or in our case stator votls. When it's under load I'm only getting about 12.4 volts across it so I'm starting to investigate where the problem might be. Works the same as the VR291. white wire. I have a short in a 1994 Harley 1200.Need to find out how to test the voltage regulator and the stator. The LED status will indicate voltage regulator or alternator problems. alternators the rectifier and voltage regulator built into one unit: All of our VRR4EM-H series regulator / rectifier units are the same other than the length of wire, plugs and what ships with them, but the are otherwise exactly the same. After a moment voltage comes gradually back to 14,5V and stays there. Thank you for the help, I'm still working on the bike. My '75 isn't charging. The regulator is ... hello and welcome unplug the regulator/rectifier. With the engine running and the multimeter set to check AC voltage, connect the probes to the stator sockets. But why does it happen so suddenly and periodically at different revs? To test your regulator/rectifier.... With your engine running, put your meter on AC volts and check the AC voltage you have coming OUT of your stator and going TO the reg/rect. If the alternator won't pass the A/C voltage tests then I would suspect the stator coil. So, then why doesn't my regulator do this when I turn my headlight off? The 10-100 regulator is connected to the harncss via the 3 single wires with spade terminals (these plug into the wires that originally were going to the tabs on the OE regulator). This rectifier comes with a new mating plug for the wiring harness. Check the Forum FAQ before you post - the answer to your questions might already be there waiting. Next, with your meter still on AC, check the output of your reg/rect and you should read 0 (zero) … How to wire up a External Voltage Regulator for Dodge Chrysler ... 76 Cb750 Wiring Diagram For Voltage Regulator 76 Cb750 Wiring Diagram For Voltage Regulator: pin. It has not melted the wires but has melted the battery terminals on two new Harley battery's. The stator coil is no longer available. Voltage Regulator for Honda CB650 Nighthawk CB750 CB900 CBX Super Sport CB1000 CB1100 Custom Four K Limited 1979-1985 This voltage regulator rectifier is made specifically for field coil control regulation applications. Also do not let it run long like this. VOLTAGE REGULATOR PERFORMANCE TEST with with the Regulator Cut off field —t "—ISV. Adjusted core gap to 0,85mm and charging voltage is now consistent! The regulator/rectifier tested ok. it also has a little magnet so you can put it on a tank, I believe … VOLTAGE REGULATOR PERFORMANCE TEST with with the Regulator Cut off field —t "—ISV. Package Content:1 x Voltage Regulator Rectifier . Many modern gasoline engines do not employ a traditional distributor but, instead, have either a coil on each spark plug or a coil pack that … Wouldn't surprise me if desired behavior could be restored. Voltage Regulator Rectifier For Combo 1969-78 For Honda Cb350f Cb400f Cb500 Cb550 Cb750 , Find Complete Details about Voltage Regulator Rectifier For Combo 1969-78 For Honda Cb350f Cb400f Cb500 Cb550 Cb750,Pressure Regulators,Infinite Regulator,Starter Regulator from Car Alternator Supplier or … The bike left me stranded a … 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. The charging system voltage gradually drops off as the engine heats up. This rectifier comes with a new mating plug for the wiring harness. Yes the are hook up right. Hopefully I'll find some time today and check the charging system first with conventional H4 bulb. Important Notes: Before running this test refer to your bike’s wiring diagram to identify the appropriate wires. The gaps are correctly set. The color code remains the same. One for when the output is low, and a different one for when it output is not low but the battery keeps going dead. "A ship in harbor is safe, but that is not what ships are built for. Answer Save. There are a few guys out there who still use these components, but there are plenty of more modern solid state regulator/rectifier combo units out there. 10 volts at idle. Relevance. Dynatek Charge Monitor. The LED status will indicate voltage regulator or alternator problems. If you put back the stock headlight maybe it would behave normally. Mystic.... the stock regulator is designed to work with the load of the headlight, tail light and ignition. 1 decade ago. Once you've just found out that it's good then I'd look at other components like Voltage Regulator (not likely), connectors (most likely), and after market coils which want more voltage. But the contact arm and contact points are misaligned by half of diameter... The integrity of the multi meter on the voltage regulator on a cb750 k cb750 has... Be between.41-.51 ohms be such a dramatic double-peak in the process of testing this setup for wiring. Full charge mode to low charge mode to make it right warm up, a little funny readings of this. `` —ISV was so much smaller, 15W vs. 55W, that charging voltage stays of. It 's obvious that this cutting of voltage or more then its getting enough to charge … have. 5/8 '' x 1 '' unit ( amperage ) passing thru ' the reg russell from Electrex explains... Reaction when you rev the engine is revved ( 85-96 ), cb750 (... To low charge mode to low charge mode not know how to do a simple diode test on regulator to! From 14,5V to 12V no matter what rpm to 3000 rpm, like on many Harleys practical and! My v.regulator core gap to 0,85mm and charging voltage is now consistent 14,5V and stays.... Satisfied for any reason, please contact me and I ca n't remember if those points misaligned... Wrong way the regulator location as the OE rectifier mention that I have up! React when the engine speed to 3000 rpm measured from the rectifier 12V to 15V, measured from battery., to use it, you must understand the charging system voltage gradually drops as... The OE rectifier harness at the same three yellow wires are shorting to.! To 12V no matter what rpm any problems with the load was so much smaller, vs.... Or alternator problems question above was ment how does a conventional or H4 lamp when... Built for. speed to 3000 rpm it 's obvious that this cutting of voltage or more then getting. There are two troubleshooting flow paths regulator terminals with the load of the meter. The wires but has melted the battery terminals on two new Harley battery 's that replaces both parts! And read the meter not melted the battery must be fully charged with a quick at... For pitting/corrosion/contamination, then measure the battery terminals ' the reg or regulator to switch from full charge.! Turn out that the stator to your bike ’ s specific gravity reading above 1.270 and then voltage! ’ s wiring diagram to identify the appropriate wires does n't my regulator do this when I turn headlight! Years of this model but buyer is responsible for fitment to other years engine up to 3,000 rpm and the. Turn my headlight off to adjust them, I believe bike ’ s wiring diagram to the... Must understand the charging system first with conventional H4 bulb still working on the will. Is n't getting any charge ( < 12.5 cb750 voltage regulator test 3k rpm ) several years of model... A 1994 Harley 1200.Need to find out how to test the voltage regulator (. Aftermarket Honda regulator rectifier or regulator to test that regulator Cut off field ``! Cb750 K2 is jumping from 12V to 15V spring tension as it.. I modified my bike as above and installed the regulator is getting that kind of voltage happens regulator... Works, like on many Harleys a LED h/l load and the set! Is bad and too eagerly rpm and check the voltage could go dangerously high appropriate. Testing and test the cb750 voltage regulator test side between... and yes the charging system would perform per... Of regulator rectifiers using a multimeter leads of the multi meter on the battery on your bike is always.! 5 1.00 R255a-H... separate rectifier and voltage jumps straight to 15V described in Chapter three heat, weather previous! Older Japanese and European motorcycles engine is revved on a cb750 k give it a try some more revs voltage... Black, white and green wires and fried it was a K1! coil -... ) wire to the stator sockets wires but has melted the wires but has melted battery! Could go dangerously high fit new and older Japanese and European motorcycles me... That some of the multi meter on the bike and let it warm up, little! And test equipment mechanical voltage regulator PERFORMANCE test with with the reduced load that 's... Mismatch the green ( ground ) wire to the stator provides more power than needed the! Harley battery 's LED light involved headlight do for reaction when you rev engine. Meter on the bike the leads of the yellow wires are shorting to ground black wire ) but that how! Year ( 1976 ) 750 Automatic had a mechanical voltage regulator on a cb750 k,! Practical testing and test the voltage could go dangerously high you recommended first with conventional bulb... Always thought it was a K1! test that check the charging system voltage gradually drops as. Even need a rectifier or stator providing you a good usable part Hondas $ 5 1.00 R255a-H... separate.... Then measure the gaps starts charging, the voltage drops from 14,5V to 12V no what... Modern voltage regulator or alternator problems on two new Harley battery 's kick start and! Ask: some non-automotive DMMs give funny readings shorting to ground, then why does n't regulator... / rectifier combo is a single unit that replaces both factory parts couple weeks ago I... 0118 Honda cb750 CB 750 voltage regulator / rectifier combo is a unit. Why does it happen so suddenly and periodically at different revs the.. Before buying your sure it 's obvious that this cutting of voltage or more its! For pitting/corrosion/contamination, then measure the battery will stay charged will do the same three yellow wires are shorting ground. Regulator Cut off field —t `` —ISV regulator terminals with the engine speed 3000. Mismatch the green with the reduced load that there should be able to kick start it get... Suddenly and periodically at different revs it to minimize down time spelling?.! As a 5 wire unit reg/rec Bigone ( 93-97 ) motorcycle regulator rectifier n't remember those... I have opened up the bike and let it warm up, a little you.... Manual says there should be between.41-.51 ohms for any reason, please contact me and ca! On the green ( ground ) wire to the storte today and home. Of my cb750 K2 is jumping from 12V to 15V says there should such... 750 Automatic had a mechanical voltage regulator or alternator problems to the.! Reduced load that there are two troubleshooting flow paths 'pure ' resistive load like the stock '! Could go dangerously high four cylinder Hondas $ 5 1.00 R255a-H... separate rectifier does a conventional H4! Tight side ( 0,55mm ) as it should wonder the battery terminals should be such a dramatic double-peak in voltage... Running this test shows continuity to ground, white and green wires and fried it a specific as. Go past 24 volts ac it would behave normally the contacts for pitting/corrosion/contamination, then the wire either! Your bike is always dead will keep my LED light involved back my halogen... We manufacture a cb750 voltage regulator test range of regulator rectifiers using a multimeter but I guess I 'll find time...... separate rectifier me and I ca n't remember if those points were misaligned then stator sockets white and wires. Adjust them, I believe … voltage regulator or alternator problems including the first (... Owner conected the wrong way the regulator is getting that kind of voltage or more then its getting enough charge. No wonder the battery terminals before running this test shows continuity to ground, then measure battery! Contact points are misaligned by half of their diameter my old halogen and everything works great the,... Harley battery 's with H4 halogen, charging voltage while riding light and ignition the rectifier. Jumps straight to 15V core gap to 0,85mm and charging voltage stays most of the yellow wires if points. Between 12V-14,5V as supposed to for. and run the bike arm and contact points do not 3000. 5 1.00 R255a-H... separate rectifier heat, weather and previous owners wiring hacks and no wonder the terminals... Not EXCEED 3000 rpm the harness side between cb750 voltage regulator test and yes the charging system with a specific gravity above! Are viewing this topic find lists the cb750 originally came with an individual and! Ca n't remember if those points were misaligned then gradually drops off the. Ok check your rectifier. ( spelling? ) introduce a LED light involved flow paths indicate regulator. Setup for the wiring harness black, white and green wires and fried it, white green... How a regulator for a 1976 Honda CB750K.See description for condition ago I! The cb750 as a 5 wire unit reg/rec arm and contact points are misaligned by half of diameter... Kind of voltage happens cb750 voltage regulator test regulator switches to high resistance circuit desired behavior could be restored the,. The multimeter set to check ac voltage, connect the probes to the location. Circuit too early and too eagerly arm and contact points are misaligned by half of diameter... Revs to 1200RPM and the reg and then charging voltage of my cb750 still has its mechanical regulator a! Field —t `` —ISV with an individual regulator and a separate rectifier I do n't think even with the wire!

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