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

[@midsouth2strokes185]

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

[@zebra5591]

🥴

[@Slobfishn]

heahhh

[@jeffwhite9001]

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

[@rmatvmc]

Awesome glad it helped out!

[@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!

[@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.

[@gregchan2109]

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

[@keanmeyer7877]

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

[@rmatvmc]

Glad it was helpful! Thanks for watching!

[@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.

[@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

[@alexs-zq6ni]

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

[@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.

[@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]

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[@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

[@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.

[@rdetme4ever552]

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

[@gdog1443]

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

[@Barrys_Workshop]

The clearest and best explanation on KZbin thanks

[@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.

[@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.

[@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!

[@shammon1]

Great graphics, made it easy to follow

[@ghulamfarooq3587]

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

[@abderrahmanehabbaaina141]

The best simpl and clear explained regulator opertion system. Thank you so much,

[@rmatvmc]

Glad you liked it. Thanks for the feedback and for watching!

[@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

[@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?

[@PaulR387]

Brilliant video, well done on explaining this so well

[@viliivanovtube]

Brilliantly explained and demonstrated. Love people doing great job. Thank you.

[@albertdacuma7866]

This is the best video I've ever watched on how to check regulator/rectifier, thanks!

[@rmatvmc]

Thanks *Albert Dacuma.* Were you able to figure out your issue?

[@albertdacuma7866]

Yup! other videos the're just simply talking without any support unlike yours, you have the wiring diagram. More power and God bless!

[@rmatvmc]

Good to hear. Thanks for tuning in to our channel!

[@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.

[@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.

[@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.

[@PedroAmaral-ny5ou]

Simple explanation, great video. Thanks for sharing.

[@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

[@rob2475]

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

[@UpStuff]

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

[@Antimortem]

Love your simple tutorial 👍

[@luis8bgt]

Thank you. Best tutorial, I just solved my problem and I agree with all the positive reviews. Thanks

[@lukaszdybaa3178]

great showed illustration how it works 👍👏👏

[@scrumjohnson]

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

[@fredparsons6956]

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

[@noearias2006]

Thank you for your video it’s very interesting and helpful

[@rmatvmc]

Glad it was helpful!

[@jonandbrendachristie686]

Awesome dude! Cheers!

[@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

[@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.

[@paulscontainersltd.4020]

I got the same year of impala up here in Sturgis s.d I’m going to switch to a hi output alt Great video btw, love to see more of them Well explained and to the point My girlfriend liked it to Ttul

[@iwfmconfig2iwffmconfig281]

Good video but you give the expected voltage range for the forward bias test but you say nothing about test results that fall outside this range?

[@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 🤔

[@petermorthen]

Great video....simple and to the point. Exactly what I was after. Thanks.

[@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

[@dannymacarthur13]

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

[@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 ?

[@diycreativeworks8060]

Good explanations. Thank you.

[@antocool7658]

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

[@joebednar9420]

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

[@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

[@davidsim4819]

great One ..excellent Tuto ..easy to understand - easy to find the fault

[@rmatvmc]

Thanks *David SIM!*

[@hujdupahuj]

One more test that should be performed while your in diode mode is test positive and negative leads of stator and make sure it reads “OL”. That should be the first test in fact, as my bike stopped suddenly no warning and the rectifier melted inside , and not until I performed this test against a good / new unit I wouldn’t have known. Also the rectifier past all the other tests so according to your video it would have been deemed good... FYI

[@joevillan892]

I did the reverse bias test by placing the red dial to the positive (red wire) and Black dial to the yellow wire and I got a reading of 5.96

[@russellledbetter3121]

Excellent, excellent, excellent! Thank you!

[@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.

[@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

[@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

[@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.

[@julienjo4097]

Excellent MERCI 👍

[@LamarwestTownhome]

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.

[@maikelnait4495]

Thanks for doing this!👍

[@behcetsepetcioglu7639]

Thanks👍

[@EUC-lid]

Thanks! This helped loads!

[@bahamiandjcue6687]

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

[@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?

[@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

[@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?

[@mikeedwards6905]

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

[@hardyhandshake]

Ol means overload or infinity

[@brandonlee1547]

I would die in the wild without the internet.

[@bobbychicano]

Thank you for the clear explanation.

[@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

[@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?

[@alvinlaw8890]

Great video. Love the circuit flow illustration. But I cannot find your video on how to test stator. Could you please show me the link to that video?

[@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

[@stanleykania7184]

Nice job..

[@benxiong5181]

very well done and easy to understand. Thanks

[@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

[@edwardhorvath5731]

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

[@iMr.Jetpacks]

Great explanation, but that all seems very complicated. I think I'll just take my bike to the shop and pay for it

[@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

[@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.

[@lylehumphreys9099]

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

[@ВладиславКучер-е2у]

Hello Rocky. Can you tell me how to check single-phase ? have husky 250 2016, problem with charging, 13,5V on the battery, check all(all is same manual) cant find problem, may be can you help me.

[@Bruce111684]

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

[@MC71]

I recommend to change the OEM Regulator and OEM Stator (both at the same time) to avoid electrical issues.

[@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?

[@devinward4216]

Thanks for the video!

[@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!

[@FranciscoGalicia]

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?

[@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?

[@andreww3278]

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

[@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.

[@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 ?

[@harel420]

Can i put a 3 phase rectifier to a 150cc motobike?