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Thread: Pretty sure my Alt. just shit the bed.

  1. #1

    Pretty sure my Alt. just shit the bed.

    Just cranked it for the first time in 2 weeks. Drove it up the street to get gas and dinner. Decide it's a bit chilly so I turn on the heat. I hear a funny thunk in the engine bay, feel it through the brake pedal and the batt light comes on. Volts are sitting just under 12.

    Bad alt?

  2. #2
    There will be Blood! verified
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    Check the belt. It might have gone missing.

    And great Tool reference in the title!

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  3. #3
    good call. though everything else was pumping right a long.. but that would account for the thump.

  4. #4
    Definately inspect the belt, but if the belt is still there, Take out a volt meter and measure the output of the alternator before replacing it. Don't want to go wasting money if it's not the problem.

  5. #5
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    Aside from the thump sound, check the IOD and fuse if you don't see any other issues. There's a clip-on cover that you can measure alt voltage at right in front of the fan, but BE CAREFUL and use an extended probe; fans do nasty stuff to bare hands.
    1995 VR4 Coupe


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