1994 silverado left tail light circuit shorts out. why?

they will do that. dirt and mud flies up around it and shorts out the bulb socket.take the bulb out and spray some silicone grease up in the socket and stick the bulb back in. if it still won,t work then check the bulb and the ground on the side of the socket. the ground is the wire by itself on the socket.

I believe that model has a circuit board behind the tail light. It must be bad. You can get one at the dealership.

examine the bulbs to verify are they blown, fuses and brake easy change down on the brake pedal. There commonly the 1st issues to analyze. Then if no longer must be undesirable wiring bulb holders , examine theres no moisture close to lighting fixtures furnishings or interior the lens

The circuit board must have gone bad. Get a new one at http://www.rj-performance.com/ They might have good deals.