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Thread: 10-SI alternator checks good but discharges when in car.
          
   
   

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  1. #1
    mr-natural is offline CHR Member Visit my Photo Gallery
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    Quote Originally Posted by firebird77clone View Post
    What's the voltage doing?
    Voltage drops a bit below static when car is running - maybe down to 12.4 or thereabouts
    but I don't run it very long after starting. Just long enough to see if anything has changed. How about this - has anyone had problems with an accurate diagnosis on an alternator from a parts store?

  2. #2
    NTFDAY's Avatar
    NTFDAY is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: '66 Mustang, 76 Corvette
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    Quote Originally Posted by mr-natural View Post
    Voltage drops a bit below static when car is running - maybe down to 12.4 or thereabouts
    but I don't run it very long after starting. Just long enough to see if anything has changed. How about this - has anyone had problems with an accurate diagnosis on an alternator from a parts store?

    Yes and most of them suck. As stated above you have a bad alternator, probably a shorted diode. They normally show open when bad, but that doesn't mean that it can't be shorted which, IMHO, causes your ammeter to indicate a very heavy discharge.
    Ken Thomas
    NoT FaDe AwaY and the music didn't die
    The simplest road is usually the last one sought
    Wild Willie & AA/FA's The greatest show in drag racing

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