Question about 2005 GMC Envoy

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While driving headlights dim briefly and at the same time voltage drops for about 5 seconds almost always within the first minutes after cranking the engine.......Most recently the lights go all the way out after pulling over and parking they come back on after 15 or 20 seconds....once they come back on they stay on for the rest of the trip

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  • 149 Answers

Sonds like trouble with alternator. check to see what volts you have coming from it.

Posted on Sep 13, 2010

  • Robert Wiles Dec 25, 2012

    i dont believe its the alternator it is the secondary air pump located under drivers floor pan

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