i have a promblem with my park light and tail light and i have a brown wire but on 1993 Chevrolet G Series Van (G20)

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i have a brown wire that cut them on but it seem like it;s
(1) Answer
older gms are famous for rear taillight sockets rotting out remove the the taillight and check if circuit board is metal .gm came out with a plastic board because the metal ones always rotted out