My lights go dim then bright as I idle or drive?

1989 BUICK SKYLARK
150,000 MILES • 4 CYL • 2WD • AUTOMATIC
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My lights go dim then bright as I idle or drive. They stay either on for a couple minutes then change. I do not think it is the alternator because it does not brighten with acceleration. Please help me.
Oct 19, 2010 at 11:06 PM
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Have the battery load tested. Check the battery cables for good connections. Test the alternator output for voltage and amperage.
Oct 19, 2010 at 11:09 PM