1990 Ford Mustang GT Q&A

1990 Ford Mustang GT Question: why is my headlights intermittently-flickering after about 20 minute.very scary.

when i drive at night i have to hurry home before dark.i have no diagnostic code but i did change my headlights to a one pieces sets and use the new wire that came with the sets.never had no trouble until i made the change. -
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