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ALTERNATOR TESTING

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  • #639785
    drthrift035drthrift035
    Participant

      What is the simplest way to check an alternator outside of a vehicle to verify before selling it ?

      What if I just hook it up to a car battery and if it spins then it works ? Please let me know.

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    • #639789
      college mancollege man
      Moderator

        The alternator should spin without hooking it up. You can take it
        to an auto part store and have it tested which is not 100% or spin
        the pulley and see if any noise is heard.

        #639803
        Lorrin BarthLorrin Barth
        Participant

          If you want a 100% answer take it to a shop that repairs alternators and have them put it on their test apparatus.

          #640142
          DavidDavid
          Participant

            Advance or Autozone can test the alternator, not sure what kind of load it puts on it, if any but it can tell you if you have an alternator problem or a problem with the PCM or wires.

            #640144
            Gary BrownGary
            Participant

              Just hooking an alternator to a battery will not make it spin. An alternator spins by mechanical energy which is why it’s hooked up to a drivebelt. The alternator supplies current to the battery when the engine is running. You can spin the alternator by hand and look for bearing noise etc, but don’t expect it to spin on it’s own without some sort of driving force!

              #640506
              EricTheCarGuy 1EricTheCarGuy
              Keymaster

                Easiest way when it’s out of the vehicle would be to take it to an auto parts store that can do that testing for you.

                More info here.

                http://www.ericthecarguy.com/faq/solving-automotive-electrical-problems

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