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  • #16
    Originally posted by FestYboy View Post
    for future referance, DO NOT under any circumstance, disconect a battery while the car is running, EVER!!! can cause damage to alt and other electronics. the battery is the only thing keeping any stray AC voltage from going through your system.
    X2.

    I blew out the headlights and all the fuses in my Isuzu Pup by doing this. The alternator was also damaged, and conveniently decided to die when I was going over a mountain pass.

    Go to NAPA and let them test your battery/alt for free.


    Regards,

    Tim
    White '89L auto - Sold!
    Silver '06 Rav4, 95k!

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    • #17
      Originally posted by FestYboy View Post
      for future referance, DO NOT under any circumstance, disconect a battery while the car is running, EVER!!! can cause damage to alt and other electronics. the battery is the only thing keeping any stray AC voltage from going through your system.
      it's actually not the A/C voltage that wreaks the most havok. It's the voltage spikes that result from removing the load (battery) and the alt output surging, often upwards of 400V.
      Jim DeAngelis

      kittens give Morbo gas!!



      Bright Blue 93 GL (1.6 8v, 5spd) (Hula-Baloo)
      Performance Red 94 Aspire SE (Stimpson)

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      • #18
        So FB71, me not being and EE, but knowing a little about the the alternator setup.
        We should be seeing pulsed DC on the battery side of the alt/regulator if all is working as it should.
        So when the load is dropped from the circuit, the regulator can't adjust or adjust fast enough, and we see spikes of high(er) voltage DC then?
        '93 Blue 5spd 230K(down for clutch and overall maintanence)
        '93 White B6 swap thanks to Skeeters Keeper
        '92 Aqua parts Car
        '93 Turquoise 5spd 137K
        '90 White LX Thanks to FB71

        "Your God of repentance will not save you.
        Your holy ghost will not save you.
        Your God plutonium will not save you.
        In fact...
        ...You will not be saved!"

        Prince of Darkness -1987

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        • #19
          Originally posted by FB71 View Post
          it's actually not the A/C voltage that wreaks the most havok. It's the voltage spikes that result from removing the load (battery) and the alt output surging, often upwards of 400V.
          Essentially the car battery works in the same manner as a battery backup for your computer correct? I mean if theres a surge from the alternator the battery takes it before it can hit the system, much the same way a battery backup would take the surge from your outlet before hitting your PC.
          Search Master - Honorary Member of Midwest Festiva Inc., Gulf Coast Chapter

          Everyone is entitled to be stupid, but some abuse the privilege.
          - Unknown
          I don't like superstitious people. They're bad luck. - Serge A. Storms

          If at first you don't succeed, failure may be your style.
          - Quentin Crisp

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          - Bumper Sticker

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          • #20
            Just for clarification, i did not disconnect the battery while the car was running..
            I had read somewhere on this forum before hand that it could cause a lot of damage..(exactly what you guys are sayin..) and i am no shape to afford that sort of damage..

            My motto: be safe than sorry!!

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