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how to check alternator

This is a discussion on how to check alternator within the External Engine forums, part of the LSx Technical Help Section category; My car is ok, until I turn on a/c, the it runs battery down. How can I check altenator?...

  1. #1
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    2002 FORMULA

    how to check alternator

    My car is ok, until I turn on a/c, the it runs battery down. How can I check altenator?

  2. #2
    cutting and welding mark21742's Avatar
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    hugger orange
    2004

    quickest/easiest way, go to autozone or advance auto.
    they can do a load test and changing system test for free for you.
    while the car is running use a volt meter on the main got coming off your alt. should read between 13.5-14v, then if that reads good, check the voltage at your battery and it should read the same, this will tell you how good your wiring and connections are.
    clean all your connections on the alt, battery and starter, plus all your grounds.

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