[Tommy]

Wiring can vary from car to car, so without knowing more about your particular car, your question is difficult for me to answer. .... But, the most common cause for brake light failure in a fiberglass body car is a bad ground. Before I started tracing wiring though the entire car, I'd either check the ground connection to the brake lights, or run a homemade jumper wire from the brake light ground terminal to a known good ground. If the lights start working, you've found your problem.