1990 mercury cougar lights flicker?

  • Thread starter Thread starter plymouthneondriver95
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plymouthneondriver95

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my dad just replaced a alternator in a 1990 mercury cougar and now the headlight and dash lights flicker when you rev it the more you rev the faster the flicker he has 20 years of experience and cant figure out why its doing this he works at a electrical shop and the owners need the car soon so answers are greatly appretiatied
i forgot to mention its a V6
he changed all the grounds
 
if it didn't do it with the old alt then i would suspect the new alt has a defective voltage regulator
 
if it didn't do it with the old alt then i would suspect the new alt has a defective voltage regulator
 
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