American Cars
Headlights Tail and Brake Lights
Chevy S-10
Oldsmobile Cutlass Supreme

Why would the left brake light on a 1990 Cutlass Supreme only work if slight pressure is kept on the flasher arm?



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Quite probably you have a bad ground or a short in your wiring harness. You could always go to a garage which checks the wiring instead of a regular garage who uses the process of trial by elimination.