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Thread: 92 deville alternator

  1. #1
    Join Date
    Aug 2014

    Cool 92 deville alternator

    I am having issues with my 92 deville i suspected the alternator and took it to an auto parts store
    They tested the alternator and passed all tests
    They only run a quick test less than a minute,
    Now i do nit know what to do?
    The symptoms are the following,
    While engine running at idle with no lights or usage of any electrical component,
    Voltage reads 13.6 volts,
    But as soon i use ANY electrical item such as the power widow or turning on the headlamps or steeping on to the brake pedal
    My voltage drops to 12.2 volts and the cars starts running realy rough i can not drive the car because there is lack of power and then it starts
    Backfiring,the wird thing is my dashboard runs good no engine check light or alternator light, i am running in to wall, can anyone help me?
    P L E A S E

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
    Join Date
    Sep 2010
    East Boston MA.
    The alternator might be putting out less voltage as it hears up. What is the output when you first start the car?

    Have you had the battery tested?

    Cables and connections in good condition?


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