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It's definitely a grounding problem, and the question is where is it?
Remove and clean the ground screw (black wire to body). Clean the terminal ring as well as the body sheet metal. Try that by itself, if no luck move on.
The outer bulb socket is a dual filament socket, the only one in the cluster. Should be black on the left- white on the right.
Remove and lightly sand or file the three tabs. Put in a new bulb. Inspect for white or grey corrosion on everything. White, yellowed, or cracked bulbs means water is getting in the taillight, and it's ALWAYS in the brake light, not the others. Darn things.
Clean the flex-circuit board on the taillight with a pencil eraser. Careful, they're a bit fragile. Need to see clean copper for it to work well.
Last, quite a few of these I've seen require the bulb holder to be loosened a hair from the full-clockwise position in order to make reliable contact. I figure it's just wear. Another thing I think contributes is that the spare tire bumps into the back of the left cluster, doesn't do it any favors.
Good luck!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 230K, 88 744GLE- 220K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 94 855GLT 189K
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