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Surplus Of Voltage

Discussion in 'The Garage' started by cojnit, Oct 9, 2002.

  1. cojnit

    cojnit 1/2 ton status

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    Some one please help!?

    Trust me I searched the forums for an answer, and could find a straight one.

    My voltage reads fine before start-up, and then it goes through the roof while running. I am blowing fuses all over the place! The Blinkers, Radio, CB Radio, all blown. The truck still runs great, but I have no blinkers.etc. I have replacved the Blinker fuse 2 or 3 times already with even higher than recommended ratings.

    This is a fairly new alternator, and I had the battery tested. Is there something they could have missed? What Am i missing??????

    Trying to get the truck running for the Big Dawg Safari next week and could sure use the help!

    Thanks
     
  2. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    Voltage regulator in the alternator is probably bad. What is the voltage reading after you start it?
     
  3. cojnit

    cojnit 1/2 ton status

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    almost pegged near the 18V area. Seriously RED
     
  4. TWISTEDJACK

    TWISTEDJACK 1/2 ton status GMOTM Winner

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    Most likely the regulator. Local parts store can check the
    alternator out for you.
     
  5. Sandman

    Sandman 3/4 ton status Author

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    Yep, the regulator. If they wont waarenty it, You can buy just the regulator and put it in.
     
  6. Pookster

    Pookster 1/2 ton status

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    Voltage regulator. Im almost 100% positive. GM style voltage regulators are internal. Well, the newer ones anyways. If its new, I'd bring it in for a warranty exchange. Nuttin you can do but change the alternator, unless you feel like ripping the alternator apart. Then its like a 5 dollar part. But like someone else said, you can also buy an external voltage regulator. (I think it might be a ford part!)
     
  7. cojnit

    cojnit 1/2 ton status

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    this is on a 1976 3/4 ton. Same rules apply??
     
  8. Skigirl

    Skigirl 1/2 ton status

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    Yep. Same rules. Replace the alternator.
     

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