How to test a diode on a regulator rectifier using a multimeter

Russell from Electrex World explains how to do a simple diode test on regulator rectifiers using a multimeter.

[reecebigger]

Thanks Russel for explaining that SR Series regulators are bidirectional. I was testing my reg like a QR Series reg and thought it was faulty. Thank you for the great info.

[mario]

Wow I’ve been looking for someone to explain this to me. Finally I know what a bad reading is. Thanks

[vinnyvdalidemonet]

Electrex World Ltd I have watched many other videos on youtube "showing" how to test reg/rec and I must say in my opinion, yours is the BEST one. Thank you very much for making it and sharing it. I really do appreciate your time and effort.

[dalewalker]

This is the best explanation of testing the three phase regulator in my 2006 Yamaha Waverunner VX110. It has four blown diodes. I searched thru the waverunner sites and got nothing useful. Thank you, thank you!

[miguelasantiago]

Hi Russel. Thank You for this video. It helped me a lot on how to use my tester on my bike rectifier. I cleaned up the rectifier and it seems to be working normal now. Once again, thank You!

[peteraddison]

you are a diamond geezer. very happy i found this gem of an upload

[dritanbega]

That"s the best explanation. Thank you for info.
Be blessed

[juleswilson]

Thank you that was great. Just checked mine and you just saved me money.

Mate you are legend, you make it very easy. Cheers.

[nicocacci]

Thanks didn't know that my kawasaki z 550 ltd had a qr type ! i do now and you have put my mind at rest. i thought my rectifier was knackered but like you said it only goes one way

[xavsmash]

Thanks Russel. Very useful for my bike

[Powerman]

Hi very good video on how to do it. I have an XL 600 RM from 1986 and am trying to check the regulator rectifier, but I am not sure I am doing it the correct way. It has 3 yellow wires of course and then it has 3 more wires, a red/white, a green and a black. How should I test this? I seem to be getting no readings at all by testing it as per the Honda workshop manual. Thanks in advance.

Thomas, Denmark

[DouglasJames]

My 2007 Triumph Speed Triple has an issue trying to start. I thought it was the battery so I purchased a new one but that doesn't seem to be the problem. The issue: When trying to start the bike the starter will turn over for just a second or two and then nothing and the dash lights and headlight all go black. I tested the battery when off the bike and it says 12.95 volts but after installed and this issue arises and the dash goes black the battery, while still installed shows 1.25 volts or thereabouts, I don't remember exactly but the reading goes really low.
Then I disconnect the battery and it reads just fine, 12.9 volts. When I reconnect the same sequence happens again...Headlight and dash will come on and when I push the starter button the starter will only turn over for a second or two then stop and the lights all go black.
I pulled the alternator rectifier and tested the diodes and they all read fine, about .542 or so on all three and reversing polarity same results.
Do you think if the regulator is bad it will cause this shutting off of system and then the low volt reading when the battery is still connected?

Any input would be appreciated.
Thank you

[xxwalhalaxxmozza]

Excellent tuition, rectifier fine, turns out after market alarm has massive drain

[MrBerenguer]

Thks four your excellent video I have a Piaggio Zip 2T other day I drive and same one stop me and tell me my rear lights is blinking after 2 days all my lights is blown front and rear I’m surprise my fuse don’t blown also when I drive in full throttle same times is cut don’t the speed what you think is my regulator fault thank you help appreciate

[Great_XicoZe]

Great video!
Hope you can help on this issue:
A few days ago, while riding my SYM VS 125, a lot of smoke started coming out of the front of the bike and the engine started to fail. I turned off the ignition and cut the battery current.
At home I took it apart to see what was going on and the rectifier was visibly burnt.
I took the bike to a workshop where they changed the rectifier and the battery, but they didn't solve the problem. The new rectifier continues to heat up a lot and too fast, as if something is short circuiting.
As they couldn't solve the problem and it still cost me a few €€, I picked up the motorcycle with the fault.

Tests i have done:
- the battery is new and has 13.1V before the starter
- with the three yellow wires from the stator connected to the rectifier, the bike works fine at low revs, fails at medium and the rectifier heats up uncontrollably; with these wires disconnected from the rectifier, the bike works well at any speed, but as we know, the battery is not charged
- at idle the 3 yellow wires measure about 40V from stator
- the resistant test on stator show equal values on three wires; no ground conductivity; no open circuit on each coil
- apparently all the masses are well connected.

Any idea what it could be causing this recurrent failure of the rectifier?

Note: traditional G6Y carburetor engine with electronic rectifier and CDI, year 2010.

[chanuperera]

When I put the clutch in the gear of my Honda MC22 RR bike, the neutral bulb lights up, I replaced the diode but the problem is the same, thank you for providing a solution

[doobyboy]

This video saved my life ! Thank you so much ! Subscribed and liked !

[turbo]

Finally good video easy for smart guys like me 😂

[kartanoaakkula]

Good example case to have that defected rectifier as well.