How To Test a 3 Phase Regulator/Rectifier

[@robbiegirosky6731]

Saved many customers money by replacing a faulty rectifier vs replacement of "thought bad" stator. Great video

[@willow0910]

Wow, , you saved my day, Immensely glad I am, that I came across your video .. almost on the verge of abandoning riding my bike due to battery issues.... why didn't I find you earlier..

[@rmatvmc]

Glad it helped you out!

[@gregchan2109]

I'm from in the Philippines I am a motorbike mechanic good job sir

[@midsouth2strokes185]

If everyone took a drink everytime he says "regulator rectifier" we would be hammered by the end lol

[@zebra5591]

🥴

[@Slobfishn]

heahhh

[@Barrys_Workshop]

The clearest and best explanation on KZbin thanks

[@braddavis9111]

If only there was a good wiring diagram and specifications from the manufacturer we could actually know what it should read. Lab scope pattern. NO way. they have them but would never share them with the public to help repair their products. Thank you Rocky for all you do for the general public. I find all the instructions you give are very accurate. Electronics is my specialty but without known good specs and patterns it's all guessing!

[@StefanWerners]

Thank you for this video!! Misdiagnosed my stator as being bad before moving on to testing the regulator/rectifier on my 2016 KTM 500 EXC. Hadn't opened the case up yet and this set of tests confirmed my rectifier/regulator was still good even though I had a bad pin in the plug.

[@jeffwhite9001]

The best description and explanation of testing a reg I've seen yet.

[@rmatvmc]

Awesome glad it helped out!

[@kasunchamara9328]

you explained very simply and the diagram is very use full to understand about how to work regulator rectifier .thanks

[@rmatvmc]

Thanks for watching, Kasun! Glad it helped out.

[@pgtips9236]

I want to know if the forward readings should be a similar value on both the positive & negative terminals as mine are double the value on the negative side ?

[@macncheese1991]

This is very good info. Found out my voltage regulator was shorted to ground on 2 of 3 leads

[@rmatvmc]

Glad we were able to help! If you need anything else, let us know.

[@muzykm]

Niece video. I did your measurements. What could this mean? Positive lead bias is 0.158V but negative lead is 0.520V. Is this normal?

[@kevinpinheiro2485]

On positive pin I’m getting voltage with forward bias and open on reverse bias but I’m getting voltage for forward in negative and open in reverse. It’s consistent with all 3 pins but in negative it’s opposite of what you got in the video

[@gregreid5696]

Nice work folks. While going through your steps to do a dynamic stator test my stator performed just as you explained for a three phase stator. AC voltages at example RPM's. The thing that left me stumped was my Shop Manual states that an AC voltage reading should be between 10 and 12 VAC. Not giving any engine speed. At idle it is producing 17 VAC. Increased engine speeds also increased VAC. Should I assume this as a typo and direct my attention towards the rectifier? This is on a 2005 Bombardier Outlander 330 HO 4x4.

[@robertmeyer4744]

this goes for street scooters as well. 150CC and down usually a 1 phase. some 3 phase. I had one go bad on a scooter that showed working correctly until a long drive at night and the volts dropped. was the regulator heating up and maybe a diode or scr going open. great basic test! 6 diodes on 3 phase. getting a service manual for your bike ETC is a big help.

[@charliedeshawn7290]

i know im asking randomly but does anyone know of a method to get back into an Instagram account? I was stupid forgot the account password. I would love any tips you can offer me

[@allenjoaquin7803]

@Charlie Deshawn instablaster :)

[@charliedeshawn7290]

@Allen Joaquin I really appreciate your reply. I got to the site thru google and Im trying it out atm. Looks like it's gonna take quite some time so I will get back to you later when my account password hopefully is recovered.

[@charliedeshawn7290]

@Allen Joaquin It did the trick and I now got access to my account again. I'm so happy:D Thank you so much, you saved my account!

[@allenjoaquin7803]

@Charlie Deshawn You are welcome xD

[@dannygonzalez4017]

The 3 wire plug is the plug that runs into a stator correct?

[@alexs-zq6ni]

Had lack of a harness and this will help get things plugged in

[@bc-mr1si]

hi great video. thanks for sharing. the lights on my bike are pulsing, tail light ,headlight and neutral switch. would a faulty regulator/rectifier cause this 🤔

[@bahamiandjcue6687]

Does the rectifier deal with power to the headlights?? Can it cause no power to the headlights an high beam indicator??

[@bruceruttan2314]

Thank you. Would this unit cause me to have no power to the switch. When I turn my switch on I get nothing but if I cross selonoid it will start.

[@keanmeyer7877]

This was extremely helpful. Very clear with great graphics! Thank you!

[@rmatvmc]

Glad it was helpful! Thanks for watching!

[@gdog1443]

Thanks for your help, I’ve just correctly diagnosed a faulty regulator rectifier on my Polaris ranger 570.

[@v2vortex]

I have seen other do it yourself explain to do it both ways but you added the diagram which makes it all come together now.. thank you

[@MrBerenguer67]

Hi many Thks four your excellent video I have a scooter Piaggio 2T other when I drive same one tell me my rear light is blinking after 2 days all lights front and rear blow also when I drive in full throttle the scooter same times cut down the speed what you think is the regulator voltage have same damage my regulator is 8 pin thank you very very much appreciate

[@azertaieb442]

Hi ...what is the maximum voltage in input ?? Thank you

[@pedalandpop783]

Brilliant video, looks like my bikes problem isn't the rectifier but at least that's one thing crossed off the list...thanks for the tuition

[@beerbrewer9996]

Video is little old but hopefully you still check. I have 2007 V Star 1100 and when first started I get 13.8V at battery. After a few minutes running, I only get 12V or less. I checked stator harness and get over 48V when fast idol so I believe stator is fine. Can rectifier work in start up then stop sending charge to battery?

[@joebednar9420]

I have a 3 phase rectifier on my 2014 BMW GS F 800 Adventure. Could you show how to test that one. Thanks

[@RR-xb7dl]

Does it matter if all the forward bias readings on the positive side are 0.1 when all the readings on the negative side are 0.45? In other words, should the readings be close to the same for both the positive and negative? This is a Honda regulator.

[@timothymskerry8706]

Excellent video, and very helpful schematic animations. Easy to understand what the test is doing and now I know the problem isn’t my rectifier.

[@JustSomeOddHandle]

I’m doing this test on a Linhai 2018 400cc UTV. It’s a brand new rectifier. The forward bias test (black lead to positive, testing connector with red lead) resulted in 530 on each connector. Way outside your proposed range of 0.3-0.5. So… what does this mean? I’m testing this because this rectifier gets super hot when in use.

[@brothermikefrost7509]

Great simple explanation of how a rectifier works, i'm working on a honda pioneer 700 utv that is only charging 12.3 at idle and 13.3 at 5000 rpm. after watching this video and the one on stator i believe i have a bad rectifier but i'll know more after i perform these test. thank you Rocky Mountain atv.

[@patrobbromccreanor820]

A link straight to the Alt. check would have been handy, I checked the rec/reg and got slightly higher number on my spare e.g 583, 588 and 603.thank you for the excellent vid. on this, cheers.

[@fredparsons6956]

11.00 am. Excellent vidio Was looking for 3 to 5 as you say but got a 6. Is the regulater rectifier bad?

[@Bruce111684]

If i have 002 is it good cause when i rev the engine the voltage drop to 12.6 to 10-11volt

[@dovybar]

Hello. Negative lead on positive side I get following reading : .553,.553,.544 Positive lead on negative side : .557,.521,.551. Are the small differences indicating faulty rectifier? Thanks!

[@zookajoey6799]

Did you ever get an answer. Replaced? Problem solved?

[@lylehumphreys9099]

My battery swelled so i need to replace rectifier ? Correct thank u ?

[@edwardhorvath5731]

I am looking for the ohms standards for a 2019 Can Am Outlander. Any Ideas?

[@dannymacarthur13]

Hi, Would a broken Rectifier be responsible for the current being drawn from the battery even with the bike switched off?

[@rdetme4ever552]

This was just what I needed and too the point with only the information I needed thank you for a great vidja.

[@mikeedwards6905]

I have a Polaris 570. what do you think the normal peak starting current should be?

[@lylehumphreys9099]

My plug to the rectifier melted so i cut the wire and spliced it ..would that be consider a break in the wire and cause over charged to my battery ?

[@ΑΡΓΥΡΗΣΒΑΣΣΟΥ]

Hello in my atv (access lander 300) in dynamic test on stator show 3.5 acv , 3.5acv and 6.5 acv. The other test is good but not charging the battery. The problem is the stator?

[@shellybaker1171]

Can you replace a 2 phase stater with a 3 phase stator since i have a 3 phase rectifier?

[@shammon1]

Great graphics, made it easy to follow

[@amiah9174]

Have a 07 can am ds250 that lost spark changed the stator .the rectifier. The coil wire brand new battery and plug any idea why this machine has no spark when you crank it over

[@mikeray4673]

Hi, Thank you for your site. I have a 2001 Yamaha Vstar 1100. Tested a (NEW) rectifier bench test was OK. Ran engine to 3000RPM Volts stayed a 14.4 excellent. However, when i rode the bike, voltage jumped to 15.7? Previously I found the "OLD" battery overcharged swelled up and blown, tested the old rectifier , at 3000RPM jumped to 19+volts, i replaced the rectifier with the a NEW one and NEW battery.. Problem listed above. what tests can I perform to find overcharging, Thank You

[@moxieguy510]

Got a new regulator and decided to test before install. Getting 141 reading for positive lead side. Is that ok? Idk what low reading means. My last regulator had high readings and swapped directions. Thank you

[@5thgearpinned450]

My 2017 yz450f regulator rectifier has 2 wires coming out of it a red and black one, no matter what ohm setting i put the multimeter on it shows “0L “ but on the other wires that it plugs into “the stator connnection it shows a reading on the “20 ohm” setting. does that means that could be the cause of my NO SPARK situation , keep in mind this bike doesnt have a battery

[@theforestlizard223]

Quick question i have a small 50 cc dirt bike and the bike is set up so if the battery is mising or dead the bike wont start (no spark ) and the Regulator has gone bad and ever since i cant fing a regulator that charges my battery , basically the power is comming to the regulator but nothing comes out and i have tried 3 brand new ones , the regulator has 4 diferent colours of whire , what i'm missing here ?

[@hamoodal-mandhry5635]

Hi sir My question is When the Burgman 650 bike is running for 2 minutes, it the regulator too hot to touch by hand? Is this temperature a problem or is it normal?

[@ribsnz]

:) . Clear and consice vids . Question: 2004 Yamaha YFM4FA . Charging @ 17.50 ~ 18 volts. Specs say 14.1 ~ 14.9 v . When doing a diode test get 623 ~ 630 on both + & - sides. No OLs. What should these readings be ? ( Manufactuer/ Model... Shindengen/SH640E) Thanks

[@MadJeepTJ]

Great Video! I get 910 in my measurements instead of 300-500 as you said, is stg wrong with my regulator because my battery is not charging. I am waiting for your stator video also

[@bobbymilspaw536]

2014 polaris sportsman 570 - i ran the test as you described and believe i have a bad rectifier. findings - 1. with my mulitmeter negative on the positive battery lead i had .45 reading 2. with my multimeter negative on the negative battery lead it had 1.2 reading. 3. with my multimeter positive on either of the battery leads it had an OL reading. can you confirm this my rectifier is not functioning properly. thanks!

[@notoriousnate1975]

Is there a way to test if the stator is bad by using the wires without having to pull the fly wheel off just to check? My voltage is reading around 18 when giving it throttle I tested the voltage regulator like in the video and it seems to be ok

[@justindoubikin6384]

i have a problem with my recreg ( think) i keep blowing my main 30 A fuses i disconnected the recreg and it started up and ran fine (obviously no charging of the battery) then i plugged it back in (and checked voltage from the negative terminal of the battery and the outer casing of the recreg and it had the battery voltage i am assuming this is my issue the recreg shorting out the system and blowing the fuse? have you seen this issue before or have any tips of further troubleshooting? i tested the recreg and it was getting the appropriate values i think it is working fine other than the outer case shorting do i need to buy a new recreg or could it possibly be another issue?

[@keithchastain5630]

Justin Doubikin following! Did you ever figure out your problem? My YZF600 is doing the same thing.

[@rmatvmc]

Sorry we didn't get back to you sooner. Did you get the problem fixed? What machine is this on, year make and model? I want to look at the wiring diagram. Unplug the reg/rec and check each wire coming out of it to make sure they are all insulated from the body of the reg/rec. I think that is the only test a manual won't show but if you have continuity on any of those to ground then it's bad. I've only seen it where the positive to the reg/rec body is in the K ohms or Mega ohms and drains the battery over night. Have you checked the voltage at the battery with and without the machine running? With it running, rev the engine a up and make sure the voltage doesn't go over 14.7 ish Volts. If it goes above, then the reg/rec is bad. Sounds like you already checked the diodes, so if the other checks are ok then start looking for a short to ground somewhere. -Charles

[@rmatvmc]

@@keithchastain5630 Did you get your 600 figured out? Your bike could be overcharging or have a short to ground. Check charging voltage first to make sure the reg/rec is actually regulating. Is it the same thing where you'll unplug the reg/rec and the bike will run without blowing fuses?

[@sera56jase]

I have seen a few reg/recs short internally and cause the main fuse to blow. I'd say that is most likely your issue.

[@justindoubikin6384]

Follow up; I did just end up finding a reg/rec to replace the faulty one and haven't had any problems since

[@lukaszdybaa3178]

great showed illustration how it works 👍👏👏

[@andrijaradakovic7794]

My stator 3 phase went bad I've had to cut the wires to the rectifier as they were hardwired does it matter how I connect the new stator as the three wires are the same colour any advice would be muchly appreciated cheers

[@andrijaradakovic7794]

Also the how to test rectifier clip was really helpful and easy to follow cheers

[@naveedaka]

Can a rr unit pass these test but still overcharge??

[@craigparker6619]

Just went through the test on a voltage regulator on a 1998 Honda Foreman 400. Tests went well and the video was very informative. Thank You. Im still having troubles with the charging system I THINK!!!!!!! Crank the bike and the fan comes on. That could be the fan contol or oil temp switch. I understand that. My issue is that as you rev/increase the throttle so does the speed of the fan. The fan speed decreases as the the throttle decreases also. Upon increasing the throttle I also see voltage at the batterry increase. I have seen it up to 18.36 volts at the battery and I know this is too high and will damage the battery so I havent ran it long like this. I was wondering if anyone had any other advice on this problem. Thanks

[@rmatvmc]

If you haven't already, get the Reg/Rec replaced and test the battery as well to make sure it is OK. The voltage at the battery should stop rising around 14.7 V no matter what the RPM is. If the voltage goes very much over that (15 or more volts) then the regulator part of the Reg/Rec ins't working properly. That should take care of the fan speed problem too. I hope this helps -Charles

[@jonandbrendachristie686]

Awesome dude! Cheers!

[@mikesimmons1456]

Will the rectifier cause my atv to show OV 17.5 or so? It will be at normal voltage then start getting higher untill it reaches 17.5

[@adgfpv7606]

rt def bad r r

[@marcculliford9022]

Hey all I got a gsxr 750 the problem I'm having is when the bike is cold starts every single time but when you ride for a bit and gets up to temperature If you stop and got to turn it off again it don't like starting iv changed the battery and starter motor I'm getting 12to 13 volts when off and 14 volts when it's started so power isn't a problem if you let the bike sit for 10 15 min it's starts again it's like something gets hot and don't like it and seems to turn over like a dead battery .anything else I could try thanks

[@XenoRacing]

I'm a bit confused. My 03 WR450F has two plugs, 1 is white red yellow, the other is black. It doesn't have a positive and negative as shown here. When I attempt to follow this guide and do it regardless, it shows 2.5v on the 3rd prong and open line on all of them, even if it's reverse bias.

[@Antimortem]

Love your simple tutorial 👍

[@djaspurh]

My 2017 polaris 570 eps failed the positive bias test on negative lead

[@Mr_Fatwa]

My 2018 570 eps failed on the negative lead as well. Did you replace and was that the tonic?

[@PaulR387]

Brilliant video, well done on explaining this so well

[@UpStuff]

Thank you Sir, great explanation! Much rather know how to test my own equipment than to rely on a friend’s past experiences.

[@HanzelikR]

There are 6 pin and three phase regulator-rectifiers, 3 yellow imput wires and one Red/White, Green and Black output wires. I've learned that type of rectifier has a voltage sensing wire.

[@jonahtopping9075]

Thanks for the explanation. I just did the tests on my 3 phase rectifier. Wires: I have 3 yellows, a black, a brown and a light brown with a red trace. I had thought that the light brown with red trace was positive but when I do this I get no reading between it and the 3 yellows. If I use the brown I get a consistent reading between it and all 3 yellows. Does that mean my positive is the three brown and the light brown with red is my neutral?

[@ghulamfarooq3587]

Thanks, thanks a lot.. this much easier explanation. I have no words to say.

[@johncrow5552]

How can you get any volts when its not connected to anything? all you can possibly measure is resistance?

[@rmatvmc]

The multimeter is supplying the regulator/rectifier with the current.

[@shrimpjohnson]

This was helpful. My name is Dustin also, wow.

[@cadpagmar24]

Will this being bad cause a misfire or what sounds like a misfire after it warms up to about 140°

[@rmatvmc]

No, a misfire is not a symptom of a bad regular/rectifier. Misfires can be caused by many things but somewhere to start would be with the ignition system (spark plugs, wires, coils, etc.). Some other things to check would be with the jetting if your bike is carbureted or some sort of vacuum or fuel leak.

[@luyten1000]

Very good explained , thank you ! I still have one question ; What if the readings are above 0.500 ? I have average readings from about 0.510

[@theone2be33]

If all readings are the same you're good to go

[@bensonmike571]

Please can this rectifier regulator charge a 150 amp battery?

[@ickess]

I know this video has been around for a while but I’m testing the reg Rec on an 02 Ducati monster 750Si.e. It has 3 yellow wires so sayings it’s 3 phase. On the other plug it’s got 2 red and 2 green. Should the test be run forward and reverse for each red and green wire across the yellows like this video? So did the tests off both the + and - sides and they passed. So guessing it’s good. My reason for testing is a slow drain on the batt. I have had a swollen batt also. I replaced it. I have to put the bike on a charger if I’m not driving every couple days. I tried an amp test for parasitic draw but it must be so low the meter didn’t see it. What a pain

[@andreww3278]

The multi meter has to be digital? All I have is one with a needle.

[@Scorpio_Slayer]

So their is still a chance that a Rectifier can still go completly bad an drain, or overcharge batteries even with it passing this diode test?

[@MrSours69]

Does this and the stator stop it from running or no.. I have a 2001 Yamaha worrior 350 and the dude I got it from said that he got it running then he said the stator started smoking. Then the atv stopped running.. I replaced everything one that atv except the stator and was wondering if the stator could stop it from it running.. even got a brand new battery for it.. and it's trying to start but won't.. need help..

[@mikewhitlock1849]

Any reason I couldn't perform this test on a seadoo jetski? Has same setup and leads but seadoo shop manual for some reason says it can't be bench tested.

[@mikewhitlock1849]

Is a 3 phase regulator btw

[@fir3w4lk3r]

This method is valid only for simple rectifiers. A rectifier/regulator may have extra components in line with the positive output of the bridge rectifier preventing the measurement of half of the diodes.

[@Lipsmoker]

Thanks!! I have 3 out of 4 pins reading 5v like you said. But one reads 9!! Is this why my lights go DIM when i rev the bike?? I have checked the stator ac output and its within spec.

[@uniquecycles-westcoast8076]

really clear explained...the best thank you

[@rmatvmc]

Glad it helped out! Thanks for checking out our videos!

[@michaelpearce8661]

@@rmatvmc are their any fuses that would keep the battery from charging? Question. Should a condenser on a ohms meter read 00.0 or 1?

[@pramodlivz]

Hello, Thanks for the video. I have checked my rectifier as shown in the video and is found to be in good condition. However, when connected to the stator and the battery, the charging voltage goes over 16V So, i disconnected the rectifier from the battery and checked the voltage and it reads out in AC.. Can a bad battery damage the rectifier? STATOR: the voltage from each phase gives out 19V AC and goes upto 60V at 5000rpm so i feel it is good... Please help

[@rob2475]

Best video I’ve seen on this subject. Thank you guys!

[@Oneguygarage]

Hi. If the values is higher than .5 some are .4 , 1.3 and .9 when I out the black lead. Can you please help to know if that is good?

[@jimmyrussell3858]

My regulator rectifier has a orange wire also coming from it. What is it? What way can 3 test it.

[@GigiDAmico]

hi Mine was reading 0.507, 0.545, 0.537, so it's over 5 , is it bad?

[@antocool7658]

Great video. Can you make a video for 6pin rectifier pls.

[@tylersmith8675]

Can this test be done on a sensitive ohms setting. On the 200k I get indications that it is allowing current one way and not the other way for the positive and negative

[@creatorvoss]

Hello rocky mountain, can we also verify a 3 phase rr unit by looking at the pins on the plug/ port in the rrunit. Doesn't 3 pin on the rrunit mean 3 phase charging system. I.e the top 3 pins for the battery positive,negative, don't know what the middle pin do, and the bottom two pin for the alternator. Am i right or is there something u can add to it. Thanks

[@michaelsmallbones7816]

Hi folks. I have a Honda VF750f Interceptor which I am restoring.My issue is this , having got the bike running, after a while I noticed the battery was starting to cook so I did some electrical tests and found that the battery was being charged at 18.5 volts. I did multi meter tests on the alternator and regulator and found the alternator to be fine but the regulator was not. So replacing the regulator and battery solved the problem. the battery is new but I've used a second hand regulator I had, but it works. My problem know is that in running the engine up to temperature to then adjust carb settings I had the seat off of the bike and when I put my hand on the seat rail above the regulator and touched the regulator with my finger and got severely burnt. I now the regulator runs worm but surely not that hot. I noticed that as from standard the regulator is mounted on a stiff plastic board and not on a metal plate which I would have thought would of acted as a heat sink. Should it run this hot , or do you think this is why the previous regulator ended up over charging ? What could you recommend to solves this suspected over heating. Many thanks, Mike.

[@vonmesturi7769]

Hey! Thanks for the video I have done the test on the rectifier and the stator. Both the stator and the rectifier pass the tests. Putting a voltmeter on my battery and getting the rpm up to 5k like stated in your other videos you have posted the battery voltage does not fluctuate at all. I also disconnected the red wire from the starter solenoid and tested the voltage coming from it with the engine running and it was very erratic going anywhere from 12 to 14.5 volts but as soon as I reconnect it back to the starter solenoid it basically flatlines and there is no change in battery voltage. Any help would be greatly appreciated thank you!

[@Lazaro-138]

What about the relay starter? I thought that the relay starter also played a part on the chargin system. If it's a bad relay starter then the battery can also be drained.

[@FFdo.]

is there a specific tester for the rectifier only?

[@rmatvmc]

Using a multimeter is the only tool I'm aware of to test a regulator/rectifier.

[@behcetsepetcioglu7639]

hello, as you have shown, the regulator looks solid but no energy output, no voltage. The stator is newly clung and rugged, the outputs have ~ 50V. Is there another test method? motorhome Ktm duke 390 2016.

[@designspm]

Perfect, my regulator is not between 0.3 and 0.5 but actually 0.53, do you think it is good?

[@vespasandengines]

designspm asking the same question

[@stevea6623]

The reading is close enough - there is variation between meters and the value will change with temperature

[@RGD-Games]

on my road motorcycle... My bike runs etc as it should, But there is no charge getting to the battery.. If i disconnect battery while its running, it cuts out.. But my reg/rec is testing fine, Exactly as the video is showing, Readings one way, all the same, But not the other way of the diode etc.. Also, when the bike is idling, My reg/rec gets warm, like it should do, So this tells me, Its receiving AC voltage from the stator?!?! im confused...

[@PedroAmaral-ny5ou]

Simple explanation, great video. Thanks for sharing.