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Thread: battery or alternator?

  1. #1
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    Default battery or alternator?

    Got a question and hope you guys can help me out!

    how do you know if its you battery or alternator thats needs to be replaced?

    Thanks

  2. #2
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    Use/Buy a multimeter and test the battery and then the alternator.

    Battery should be around > ~12.6 volts
    (Car not running)
    Lower and it could mean it's not being charged or the battery is no good.

    Altenator - You need to have the car running to test and see what the output is coming out.

  3. #3
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    take a monkey wrench and put it down on both terminals, hold on tight!
    j/k, DON'T DO THIS!

    If you find that the charge is lower than ~12.6, it could be either, even neither. Check the terminals and see if they're loose or badly corroded, also check the alternator drivebelt and see if its slipping, could also be a short in the wiring or broken wires. Check all of these, measure voltage.
    "Its because they're stupid, that's why. That's why everyone does everything."

  4. #4
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    Why don't you take it to Partsource?? They'll run some tests for you and can tell you whether or not it's your battery. The tests won't cost you a thing to do.

  5. #5
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    engine not running batt. avg 12.4-13.3 V

    Enging running output should be 13.5-14.7 V

    If below on eather scale you have found which one is wrong. If low on batt. recharge and see if it will hold the charge.

    If low on alternator replace alternator
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