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Valkyrie Riders Cruiser Club > General > 1500 Tech Board > How do you test an alternator ?
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Author Topic: How do you test an alternator ?  (Read 582 times)
Bugslayer
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Posts: 783


Lubbock, Texas
« on: September 13, 2014, 12:29:02 PM »
Does it have to be off the bike, or is there a way on the bike?
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sandy
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Posts: 5392


Mesa, AZ.
« Reply #1 on: September 13, 2014, 01:01:29 PM »
Do you have a volt meter? Commonly called a VOM (volt ohm meter). Measure the "key off" voltage. ~12.2 ---- "key on" = ~12.1 ---- Start bike and slowly rev engine while measuring voltage. It should increase to ~14.2  ----- This should tell if the alt is charging.

BTW: ~ means approximately
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RONNIEB
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Posts: 146


NEWCASTLE, OKLAHOMA
« Reply #2 on: September 13, 2014, 01:56:26 PM »
What Sandy said cooldude
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1999black standard; 2000 black tourer; 1999 red/black interstate
gordonv
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Posts: 5763


VRCC # 31419

Richmond BC
« Reply #3 on: September 13, 2014, 02:54:29 PM »
Ah, but where to measure the voltage at?

I think he is saying positive lead to positive terminal of the battery. Negative can go to any ground, but I would also use the battery terminal.

Like mentioned, this will show if there is power going to the battery.

If the reading doesn't change from ignition key off, and the bike revving at higher RPM, then power is not going to your battery. Then you need to test for power output at the alternator.

Ask again after you get some more information.
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1999 Black with custom paint IS
Bugslayer
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Posts: 783


Lubbock, Texas
« Reply #4 on: September 13, 2014, 03:32:13 PM »
Good info..... Thanks!
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