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alternator testing

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  • #443577
    IronmanIronman
    Participant

      Hey, I have a question for you technical guys out there. I have people tell me

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    • #443578
      Trcustoms719Trcustoms719
      Participant

        Cause the modules in the car need good consistent Voltage.
        Never disconnect a battery on a running vehicle.
        It also puts a lot of strain on the alternator.
        I would not recommend anyone doing this.

        #443579
        spelunkerdspelunkerd
        Participant

          Although older vehicles might allow this, I would never do it, for fear of voltage fluctuation causing damage to sensitive electronics down the line. When the battery is in line, I would expect a moderating effect on voltage fluctuations caused by the alternator. On the other hand, i suspect it probably is OK to disconnect the alternator before starting the car, and then run for a few minutes, if you are trying to hunt down some problem in the system. I’ve never done that myself, either.

          #443580
          EricTheCarGuy 1EricTheCarGuy
          Keymaster

            Newer vehicles have sensitive electronics that can be damaged by a voltage spike that could be created by the removal or installation of a battery cable while the engine is running. Think of the battery as a ‘shock absorber’ as it is the alpha and the omega when it comes to the automotive electrical system, take it away and the voltage gets a little crazy because it was never designed to run without a battery. That said I’ve seen some of my fellow techincians do a battery replacement with the car running so that they did not have to worry about resetting the radio and the customer settings, I never saw them have a problem doing this however it kind of scared me a bit.

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