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1990 Chevrolet 1500 Pickup Question: What would cause random voltage spikes to around 17 volts?

 

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Visitor, 4.3L V6, Albany, NY, August 11, 2010, 04:30

I am getting about a 17v voltage spike during the first 10-15 minutes after start up. They will hold for a few minutes then drop, and return again. After the engine warms up, they seem to go away.

Any thoughts as to the cause?

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  • Answer #1

    mastertech6371 August 11, 2010, 04:55
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     Master

    alternator. repair it before it damages your computer

    Roy

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    Visitor, August 11, 2010, 05:37

    Thanks! I was thinking this or voltage regulator...

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  • Answer #2

    pm69 December 15, 2010, 19:58
     Enthusiast

    take your alt in to a auto parts store to be checked if its good then it could be your voltage regulator

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