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Thread: How Many Volts Should My Alternator Put Out?

  1. #1

    Default How Many Volts Should My Alternator Put Out?

    When my vehicle is running, how many volts should I read off the battery terminals?

    2002 Jeep Grand Cherokee Limited V8

  2. #2
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    about 13.5 to 14.4 volts
    1994 Hunter Green ZJ, 5.2L(Retired)
    2006 Commander Steel Blue Metallic 4.7 V8

  3. #3

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    I'm getting less than 13 volts, if I recall correctly it was closer to 12.5...

    I've already pulled the alternator for testing.

    Thanks.

  4. #4
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    12.5 might be straight up battery voltage

  5. #5
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    14.1-14.7

  6. #6

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    How do you check the voltage of the alternator directly?

    I tried putting my voltmeter on the thick wire on the top of the alternator and the other on the frame of the Jeep but that didn't give me a good reading?

  7. #7
    Registered oldgeezer's Avatar
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    The + and - of the alternator are connected to the + and - of the battery. Just measure across the battery + and - cables, with engine running of course. Your way should have worked unless there is a bad ground somewhere.
    2001 WJ Limited, 4.7L, Quadra-Drive -- Kenne Bell Supercharger, Stillen Rotors with MM pads (F/R), Addcos (F/R), Kolak 3 inch exhaust with large case MagnaFlow, Rogue Chrome wheels, DRL activated, and Blaupunkt 3.5" dash speakers.

  8. #8
    Rust Builds Character
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    if you're getting that low of a voltage, the alternator may have gone bad. also check the main power fuses, if both are blown, then no power from the alternator is making it to the battery
    Platinum 5.9

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