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I have a 1998 tahoe that just recently started to have lights flicker when there on. noticed both headlights and dash lights doing this.


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Sounds like a problem in the alternator.
The voltage regulator is insidethe alternator and controls how much it puts out.
It can be cycling high and low, causing the flickering, that is if it is steady intervals. Sort of up, down, up, down,...
It it is just willy nilly, could be a loose wire somewhere.


   
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Ya, sounds like alernator.
Either that or a faulty headlight switch.
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