 Easy Alternator test? |
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| ChrisReale |
 Nov 16 2006, 04:42 PM
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Sleazy  Group: Members Posts: 2,665 Joined: 20-January 03 From: San Francisco Member No.: 176  |
Is there an easy multi-meter test you can do to see if the alternator has crapped out? I guess the fact that my battery doesn't charge is proof enough, but I just wanna make sure.
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| jdlmodelt |
Jan 3 2020, 04:14 PM
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#2
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James D. Lane Group: Members Posts: 345 Joined: 30-November 12 From: Colorado Member No.: 15,210 Region Association: Southwest Region |
Okay, alternator wasn't charging. I put 12.5Vdc on D+ and DF. I had already verified good grounding of the engine, alternator, and chassis. With both D+ and DF excited, no charge from the alternator, it just matched the battery voltage. With everything connected correctly and no jumpers, the gen light on the dash is on all the time. from D+ to ground I get 5.5 volts, and from DF to ground I get 5.5 volts. from D+ to DF I get zero volts. All said and done. I bench tested a spare alternator with the same methods and it charged great. I replaced the alternator and all is well. So, just some more trouble shooting data for others to use. Voltage Regulator is fine.
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Posts in this topic
ChrisReale Easy Alternator test? Nov 16 2006, 04:42 PM
So.Cal.914 When your car is running put the probes on the pos... Nov 16 2006, 04:52 PM Rand Also check your voltage regulator before replacing... Nov 16 2006, 04:58 PM
Michael N
Also check your voltage regulator before replacin... Jan 9 2015, 12:11 AM vsg914 I assume you checked the belt first? Nov 16 2006, 05:15 PM Scott-thundercat check the battery voltage before it's started ... Nov 16 2006, 05:44 PM McMark As mentioned, the voltage regulator can be bad as ... Nov 16 2006, 05:59 PM Brew QUOTE
McMark Nope, if the bulb is burned out the alternator wil... Nov 16 2006, 10:08 PM SGB Absolutely true. As McMark says, But it RARElY b... Nov 16 2006, 10:25 PM Spoke To check the alternator assuming that the belt is ... Nov 17 2006, 09:31 AM cary Revive an old thread ..............
Just trailered... Jan 8 2015, 11:45 PM cary Did that cause the alternator light not to fire up... Jan 9 2015, 12:15 AM Dave_Darling Yes, when the VR is not plugged in, the alternator... Jan 9 2015, 11:18 AM cary
Yes, when the VR is not plugged in, the alternato... Jan 9 2015, 12:30 PM type47 I'd like to listen to a discussion on how the ... Jan 9 2015, 11:44 AM Dave_Darling
I'd like to listen to a discussion on how the... Jan 9 2015, 02:35 PM mikesmith
I believe the alt light runs off of the alternato... Jan 10 2015, 12:54 PM cary Back in business.
The new Beru VR positions furth... Jan 9 2015, 09:13 PM rhodyguy Happy motoring! Jan 10 2015, 10:35 AM |
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