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

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?

by in Albany, NY on August 11, 2010
2 answers 1 comment
ANSWER by on August 11, 2010
alternator. repair it before it damages your computer Roy
COMMENT by on August 11, 2010
Thanks! I was thinking this or voltage regulator...
ANSWER by on December 15, 2010
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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