On 1995 buick road master. While driving lights will flicker?

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tempthack02

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When driving mother old boat 1995 buick road master. Just at any old time the dash lights will flicker radio will say error, then just go away. Happens during ordinary driving. Battery is 1 month old. Had charging system tested, and everything come out good. Happens every now and then, it is more aggravation. Anyone know what this could be
 
altenator is bad...its not charging up the battery causing the lights to flicker like that since its running off the battery..id have the altenator checked out
 
kiether has it right could also be a bad ground on the lighting circuit but have the alternator checked sounds like a bad brush or diode treo going out.
 
first thing i would do is make sure the battery termanals are tight if it is loose it could cause this also ive seen people replace the termanals and some places paint them red for positive and green for negative sometimes the paint on the inside of the termanals that connect to the battery does not make a good enough connection clean them and make sure they are tight
 
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