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Guest Message by DevFuse

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how do I

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3 replies to this topic

#1 JWX


    Lonely driver

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Posted 22 September 2003 - 11:23 PM

check my alternator?

#2 calebz


    Andys Coupe killed my cat

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Posted 22 September 2003 - 11:50 PM

You can check your voltage by simply putting voltmeter leads on the battery posts while the car is running.. should come out about 14v or so

#3 GLCraig



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Posted 22 September 2003 - 11:57 PM

Well what I like to do is take a DMM (digital, multi-meter) and connect the + lead to the output lug of the alternator (this is the connection with the nut) and the - lead to the negative terminal on the battery. From there I do 3 tests.

1. Voltage check at idle, It should be between 12.5 and 14.5 volts.

2. Voltage check at 3000rpm, it should be between 13.5 and 14.5. I maybe below 13.5 but it should be higher then the reading you get at idle. If it's above 14.5 then you probably have a bad regulator.

3. AC voltage test, sometimes the diodes get week and leak AC if you get about 1vAC it will cause problems and may damage a digital dash.

#4 theDirtyRue


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Posted 23 September 2003 - 12:01 AM

Or, you can take it into a napa or shucks or some place like that and they will do it for free. If you dont want to take it out, just drive your car to a Les schwab tire store, or some other place that does a full charging system test.

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