Question about 1998 GMC Sierra

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The battery light is flickering on and off on the dash. I put a new battery in and had my alternator checked out(its prefect) When driving at night my headlights dim and brighten.What could this be?

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The regulator in the alternator is most likely the problem.
The alternator could be charging.......just not correctly....... the flickering headlights are showing a varying voltage.......and with the charging light flickering too..........99% chance you need a complete rebuilt alternator.

Posted on Oct 05, 2009

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Check your alt. belt might be loose,or if serpentine ,might be slipping or tensioner worn.

Posted on Nov 20, 2013

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That's possible although sometimes its only a wire has shaken lose

Posted on Dec 12, 2011

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