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FOr the backup lights, the problem has to be in the taillights themselves. Try a different bulb and socket on the right side. Try cleaning the contacts with a pencil eraser in both taillights- the left one I believe makes the circuit path to get to the right one, and it only connects if the connector is plugged in securely. The pin I believe has to connect to the flex circuit on the left light, then go out on another wire to the right light.
I just had 2 non-working brake lights in my 89. Turned out to be lousy connections at both sockets. Clean the flex circuit, file the three pins, and make sure the white socket is on the right side light.
Clean inside each socket and get new 1157 bulbs (dual filament) for the brake lights. The single lights, like the backup lights, are the 1156. The parking light singles are a different number I can't remember off hand, but take one to the store and match it up if needed. Common bulb any parts store should have.
If the bulbs come out white, yellow, cloudy, or cracked, it's from water getting into the housing. Seems to happen to the left one first, and the only permanent fix is a new assembly ($$$). Try drilling a 1/16 hole up into the outer corner of the brake light in order to drain water from it. This will extend the life of the housing for years potentially.
Good luck!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 234K, '82 245T/M46-182K, '89 244DL/AW70- 212K Not too distant past: 86 244DL 215K, 87 244DL 239K, 88 744GLE 233K, 88 244GL 147K, 91 244 183K
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