I have a 2000 Express and have the same problem. I took it to the dealer and they said the light socket is bad. They wanted $200 to fix. I took the light assembly apart and wiggled the wires while my daughter applied the brakes and turned the lights on and off. I got the problem to go away when I placed the wires in a certain configuration. Must have been a short. If it happens agin, I will order the socket and replace it myself.
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