cb750 voltage regulator test
New For Honda CB550K 1975-1976 1978, CB750 1969-1974 Voltage Regulator Rectifier. None of the yellow wires are shorting to ground. Dynatek Charge Monitor. The bike left me stranded a â¦ 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. Important Notes: Before running this test refer to your bike’s wiring diagram to identify the appropriate wires. A great forum. Well, we put our heads together and made a easy to install and … If this test shows continuity to ground, then the unit is bad. I have a short in a 1994 Harley 1200.Need to find out how to test the voltage regulator and the stator. 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 … Charging voltage of my CB750 K2 is jumping from 12V to 15V, measured from the battery terminals. Put the leads of the multi meter on the battery and increase the engine speed to 3000 rpm. Any ideas woould be great. Yes the are hook up right. The manual says there should be between .41-.51 ohms. + pos to starter and - to ground. Rev the engine up to 3,000 rpm and read the meter. 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. This type of system regulates battery voltage by turning the field coil in the electromagnet rotor on and off to control when current is produced in the stator. Turn out that the previous owner conected the wrong way the regulator terminals with the black, white and green wires and fried it! For example, note that there are two troubleshooting flow paths. Plus I discovered there are actually points in the regultor that might need to be re-gapped....I tried it but not sure I got it right..is there any test using the multimeter to check the regultaor? ... Don't even need a rectifier or regulator to test that. Relevance. Thanks alot for everyone's input! Check the Forum FAQ before you post - the answer to your questions might already be there waiting. Anonymous. the CB750 automatic. ... electrical fault finding and practical testing and test equipment. 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. ECCPP Voltage Regulator Rectifier Fit for 1968-1973 Honda CB350 1973 Honda CB350G 1974 Honda CB360 1974 Honda CB360G 1975-1976 Honda CB360T 1967-1974 Honda CB450 31700-455-671 Rectifier Regulator OE :31700-102-731 6V Voltage Regulator Rectifier for Honda SL100 SL125 CB125 S CB125S CL125 … you … I've read that some of the mechanical regulators were adjustable, early CB750's, for example. But why does it happen so suddenly and periodically at different revs? The battery box, where the stock regulator mounts, floats on its rubber mountings and is not a ground. The bike left me stranded a couple weeks ago, I was able to kick start it and get home which was cool. CB750 Voltage Regulator Adjustment.jpg (659.04 kB, 1873x2061 - viewed 44 times.) + CB750K8. with giving it some throttle it should be able to go past 24 volts ac. Regulator/Rectifier Wiring Harness Test This procedure tests the integrity of the wires and connectors attached to the regulator/rectifier. + pos to starter and - to ground. Any deviation and it's jacked. Relevance. The stator coil is no longer available. Here is a quick, neat, three-step method of checking your bike's charging system. relay to know when to switch from full charge mode to low charge mode. white wire. Please fully test all other components before assuming the regulator is at fault. Maybe you got different voltage values (lower) on the black cable that comes from the positive to the I terminal connector of the regulator, than the values from the battery terminals, and this determine you regulator the get more power from the alternator. Logged "A ship in harbor is safe, but that is not what ships are built for." Free shipping So, then why doesn't my regulator do this when I turn my headlight off? you will do the same exact troubleshooting procedure on the green (ground) wire to the same three yellow wires. I finally found the time to dig into this problem properly. 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. 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. R255a rectifier for 1969~1978 SOHC in-line four cylinder Hondas $5 1.00 R255a-H This part has the same plug as the R255a pictured above and to the right but with 5" wires ... separate rectifier and The LED status will indicate voltage regulator or alternator problems. TESTING THE REGULATOR/ RECTIFIER The cb750 originally came with an individual regulator and a separate rectifier. 1 Answer. After some more revs the voltage drops back to 12V. Get a multi meter and instructions for its use. Aftermarket Honda Regulator Rectifier | OEM Style Honda â¦ It fits several years of this model but buyer is responsible for fitment to other years. My question above was ment how does a conventional or H4 lamp react when the engine is revved. Excerpted from a CB750/550 Wiring Diagram. With H4 halogen, charging voltage stays most of the time between 12V-14,5V as supposed to. 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. Culprit was the LED bulb. 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 … Our regulator rectifier combo kit is easy to install and fits the Honda CB175, CL175, SL175, CB200, CL200, CB350, CL350, SL350, CB360, CL360, CJ360, CB450, CL450, CB500T motorcycles. 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. I have been told that the voltage regulator is mechanical and there really is not a way to test it but I have adjusted it according to the manual. So my battery isn't getting any charge (<12.5 above 3k rpm). Hi! 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. The factory voltage regulator (limits total voltage to the battery ) and rectifier (converts AC to DC) were barely up to the task back in the day. In the process of testing this setup for the '80 to '84 models I modified my bike as above and installed the regulator. The contact points are misaligned by half of their diameter.. R255a rectifier for 1969~1978 SOHC in-line four cylinder Hondas $5 1.00 R255a-H ... separate rectifier and voltage regulator. it also has a little magnet so you can put it on a tank, I believe … 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. Anonymous. But what bugs me is that with the original regulator, I pushed the bike pretty hard, for about an hour, hour break and then for another hour, and it was fine months after that, then, the other day I took it out on the freeway again, pushed it a bit( for like â¦ The regulator/rectifier tested ok. Adjusted core gap to 0,85mm and charging voltage is now consistent! Oops, sorry, I missed that there's a Led light involved. Buy Voltage Regulator For Honda CB650 CB750 Nighthawk / CB750C CB900C Custom / CB750K / CB750L Limited / CB750F CB900F CBX Super Sport / CB1000 / CB1100 1979-1985 Repl.# 31600-425-008 31600-MG5-000: Regulators - Amazon.com FREE DELIVERY possible on eligible purchases 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. One for when the output is low, and a different one for when it output is not low but the battery keeps going dead. 1 decade ago. I ride it and work on it to minimize down time. I had the same issue. Sounds like a problem with the regulator itself. At 1000 RPM the voltage is around 12V. Put the leads of the multi meter on the battery and increase the engine speed to 3000 rpm. Hence the sudden voltage drop. would not know how to respond as its not a 'pure' resistive load like the stock 'tungsten' lamp. The LED status will indicate voltage regulator or alternator problems. Yep. the CB750 automatic. 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? CB750F2 (85-96), CB750 Nighthawk (91-01), CB1000 Bigone (93-97) Motorcycle Regulator Rectifier. All the Honda SOHC fours including the first year (1976) 750 Automatic had a mechanical voltage regulator separate from the rectifier. I have a multimeter but I'll go to the storte today and get the one recommend and give it a try. VOLTAGE REGULATOR PERFORMANCE TEST with with the Regulator Cut off field ât "âISV. (mismatch the green with the black wire). It needs that load ( amperage ) passing thru' the reg. 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. Free shipping for many products! That is how a regulator for a PM alternator works, like on many Harleys. You are bidding on the voltage regulator for a 1976 Honda CB750K.See description for condition. Some more revs and voltage jumps again straight to 15V. The regulator is ... hello and welcome unplug the regulator/rectifier. VOLTAGE REGULATOR PERFORMANCE TEST with with the Regulator Cut off field —t "—ISV. Answer Save. 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 … Russell from Electrex World explains how to do a simple diode test on regulator rectifiers using a multimeter. how do i test voltage regulator on a cb750 k? Thanks for your replies! Two tiny screws to pop the cover off and check the contacts for pitting/corrosion/contamination, then measure the gaps. If this test shows continuity to ground, then the unit is bad. 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. The regulator doesn't shunt the excess current to ground. 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! It is important that the stator provides more power than needed by the motorcycle so that the battery will stay charged. 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. But the contact arm and contact points do not line up properly. Hopefully I'll find some time today and check the charging system first with conventional H4 bulb. It's definitely a fine balancing act. 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. 05-26-2016, 12:29 AM #25. $59.99 + $6.99 Shipping. ", 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. 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). Reason I ask: some non-automotive DMMs give funny readings. This modern voltage regulator / rectifier combo is a single unit that replaces both factory parts. Fire up the bike and let it warm up, a little. 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. Then the wire from either the breaker points or the ignition module goes to coil (-). Thank you for the help, I'm still working on the bike. regulator/rectifier. Regulator/Rectifier unit for the 1979~1984 DOHC CB750 through 1100cc Honda … And it worked but I guess I'll have to update to solid state regulator. 1 decade ago. Next, with your meter still on AC, check the output of your reg/rect and you should read 0 (zero) … After a moment voltage comes gradually back to 14,5V and stays there. This rectifier comes with a new mating plug for the wiring harness. 1972-1974 Honda CB350F 1975-1977 Honda CB400F 1971-1973 Honda CB500 1975-1977 Honda CB550F 1975-1976 1978 Honda CB550K 1969-1974 Honda CB750 1975-1978 Honda CB750F 1975-1978 Honda CB750K 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 â¦ Package Content:1 x Voltage Regulator Rectifier . CB700 VFR700 CB750 VFR750 Regulator Rectifier: Displaying 1 to 60 (of 116 products) Result Pages: 1 2 1980-1982 Honda CB750C CB 750C Custom Regulator Rectifier $89.99 1981-1982 Honda CB750C Custom Regulator Rectifier $98.99 1981 ... 1983-1985 Honda VT700 Shadow Voltage Regulator $114.99 1983-1985 Honda VT700 VT 700 Shadow Regulator … ", CB 750 K0 ( always thought it was a K1!) The 10-100 rectifier plugs into the harness at the same location as the OE rectifier. Yes the are hook up right. With the headlight load effectively removed ( LED light ).... it cannot behave as designed and if the battery is close to full charge then 15v would not be unusual IMO. Found out that my v.regulator core gap was on the tight side (0,55mm). if the regulator is getting that kind of voltage or more then its getting enough to charge … Regulator – Regulates voltage so that it stays within the specified range. https://www.motorcycleproject.com/text/regul_adjust_750.html If the overcharge remains it is likely a bad regulator, if it disappears the regulator is working correctly and the fault is a voltage drop in the connection between the two points. If that checks out ok check your rectifier.(spelling?). Add 40 years of heat, weather and previous owners wiring hacks and no wonder the battery on your bike is always dead. Here's my problem. 0 Members and 1 Guest are viewing this topic. 4. Figure Generator Regulator Removal Adjustment And Test Wiring Tm 20to â¦ white wire. This … I don't think even with the reduced load that there should be such a dramatic double-peak in the voltage. This regulator was used on virtually all Chrysler products from 1970 to … Login with username, password and session length. Everything I can find lists the cb750 as a 5 wire unit reg/rec. b. T with Connect 12V batteries resistor with a Son in Test go out when 14â1 SV by the RECTIFIER GENERATOR REGULATOR BATTERY,'CHARGING SYSTEM GREEN WHITE BLACK RESISTOR son rwo FULLY CHARGED BATTERIES VOLT METER Voltage Regulator. Any problems with the rotor will cause a loss of output. 3 yellows from the stator, 1 to the batt + and 1 to batt â¦ Fits: All Honda CB750's (1969-1978) with 7/8" bars Part #: 24-2660 USD$25.95 ea … Wouldn't surprise me if desired behavior could be restored. - If the alternator starts charging, the regulator is likely the problem. Honda Rectifier / Regulator CB500 / CB550F / CB550K | Common â¦ If you are not satisfied for any reason, please contact me and I will strive to make it right. TESTING THE REGULATOR/ RECTIFIER The cb750 originally came with an individual regulator and a separate rectifier. 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. Favorite Answer. 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 I have a short in a 1994 Harley 1200.Need to find out how to test the voltage regulator and the stator. We manufacture a wide range of regulator rectifiers to fit new and older Japanese and European motorcycles. 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. The proper connection for a coil is that the voltage from the ignition switch goes to coil (+). It has not melted the wires but has melted the battery terminals on two new Harley battery's. If your sure it's a carb problem; it's ignition. Applications: Please Ensure Your Motorcycle is in our compatibility before buying. "A ship in harbor is safe, but that is not what ships are built for. 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. However, to use it, you must understand the charging system. The charging system voltage gradually drops off as the engine heats up. 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. The field coil tests at 8.2 Ohms no short to ground, the manual says it should be at 7.2 does that make it bad, some have said no. ... Rev it over 2000 rpm and check the voltage. I have a 1975 Honda CB750. 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. regulator/rectifier. To obtain accurate test results, the battery must be fully charged with a specific gravity reading above 1.270. The arm moves against spring tension as it should. Sorry, forgot to mention that I have done exactly what you recommended. I am committed to providing you a good usable part. Get a multi meter and instructions for its use. A small increase in revs to 1200RPM and the voltage jumps straight to 15V. with the h/l off, but then introduce a LED h/l load and the reg. Does it 'jump' too when it becomes brighter or gradually? Everything I can find lists the cb750 as a 5 wire unit reg/rec. 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. how do i test voltage regulator on a cb750 k? 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. This rectifier comes with a new mating plug for the wiring harness. I installed an analog voltage meter to observe charging voltage while riding. 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. The Dyna Charge Monitor is a valuable addition to vehicles with a battery ignition and a charge system as found on nearly all stock vehicles. I stand behind my parts 100%.. 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). 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. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. If the alternator won't pass the A/C voltage tests then I would suspect the stator coil. and test the harness side between ... and run the bike. If you put back the stock headlight maybe it would behave normally. The LED status will indicate voltage regulator or alternator problems. The regulator contacts are not visibly pitted/corroded. 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. Fire up the bike and let it warm up, a little. Favorite Answer. Now repeat the charge amps test, but this time, DO NOT EXCEED 3000 RPM, the voltage could go dangerously high. Mystic.... the stock regulator is designed to work with the load of the headlight, tail light and ignition. Replaces OEM Part: 31400-292-670, 31700 … Works the same as the VR291. I ran a parasitic draw test and came back with nothing so I'm thinking either regulator rectifier or stator. ... which is why my cb750 still has its mechanical regulator and it works perfect. CMSNL lists one but they want $850! I have opened up the regulator a few years ago and I can't remember if those points were misaligned then. 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 … My 1978 Honda CB750 bike is not charging. 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). … The load was so much smaller, 15W vs. 55W, that charging voltage jumped up and down. 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. 10 volts at idle. ... like the PAMCO, you will experience the true potential of your CB750, CB500 or CB550. ... ↑ Older style CB750 combination ↑ ... (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. 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. Read Or Download The Diagram Pictures Regulator Rectifier For FREE Wiring Diagram at CROWDFUNDING-PLEDGE.DEMO.AGRIYA.COM 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? $16.59. You should be at least 13.5v, but no more than about 14.5 or so. What does the headlight do for reaction when you rev the engine? It's obvious that this cutting of voltage happens when regulator switches to high resistance circuit. Got it figured out! Good post Mystic... and yes the charging system would perform as per your dia. Share - #0118 Honda CB750 CB 750 Voltage Regulator Assembly #0118 Honda CB750 CB 750 Voltage Regulator Assembly. My '75 isn't charging. With the engine running and the multimeter set to check AC voltage, connect the probes to the stator sockets. The CB750's OEM manual had directions on how to adjust them, I believe. 1 Answer. I switched to LED for more brightness. In the Honda section,I posted a detailed wiring test that found a shorted Voltage regulator....that is,key switch on and the black wire attached to the voltage regulator … The first dynamic test allows you to check the rotor that contains the magnets and spins around the stator. This caused the regulator to switch circuit too early and too eagerly. But my old Chiltons manual tells me in order to check the alternator output I need an ohmmeter and a voltage meter and you connect them in series to the positive side of the battery and this will tell what the alternator looks like...well no a days you buy these digital multi purpose meters so I don't know how to hook that up to the battery and check alternator out put??? It is important that the stator provides more power than needed by the motorcycle so that the battery will stay charged. You should read around 25 Volts AC. 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. My '75 isn't charging. Answer Save. Measure the battery’s specific gravity as described in Chapter Three. 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. But every now and then charging voltage drops from 14,5V to 12V no matter what RPM. Also do not let it run long like this. The color code remains the same. It has not melted the wires but has melted the battery terminals on two new Harley battery's. Put back my old halogen and everything works great. The gaps are correctly set. If I will keep my LED light I mean. Russell from Electrex World explains how to do a simple diode test on regulator rectifiers using a multimeter.