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My driver's side brake light doesn't work. Now I know the obvious question is, have I tried a different bulb? Yes, I have. That out of the way... hehe
The low, umm.. low intensity? Low-beam? of the light works, i.e., the parking lights. But the hazards, turn signal, and brakes won't make it light up any brighter. Right side, and every other light for that matter, works just fine. The rear driver's side taillamp just doesn't get any brighter.
I would check the socket first to make sure the bulb is making good contact, and free from corrosion, and that no wires are loose. Next I would check the ground.