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Q:

my brake lights and reverse lights work together.right blinker makes rev blink. on 2002 Chevrolet Silverado 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
have added frame and body grounds to tail lights and it still does it help!
(1) Answer
Tail light circuit boards give some trouble also trailer wires (if equiped) check for moisture, damaged wires also.