Join Date: Apr 2009
Location: San Bernardino, Ca.
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Had this problem on my Ford Ranger but it has to be similar. It turned out to be a bad ground on that side. (Drivers side in my case) The tail light and brake light circuits are both grounded when they're off. One will find a ground through the other as long as only one is on at time. When you hit the brakes, both circuits are on, you have no ground so every thing goes off. I fixed it by replacing the socket.
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