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If both rear lights have gone out, but the third brake light still works, then it is in the bulb failure relay. The connection that usually burns out is up on the top deck of the circuit boards inside it. I can't remember which pin, but with close inspection it should be noticable that the solder joint is blackened a little. If you're not certain, resolder all the ones you can reach. All you have to do is flow them a little bit. A bit of cleaning with a fine wire brush before hand would help, and a little soldering flux paste will make things go easier. You don't really need to add any more solder than you need to keep the iron clean- just reflow what's already on the board.
Work carefully to avoid making any bridges or short circuits between pins.
The brake light power wire comes from the switch to the relay, on one pin, then leaves the relay on two pins to go to the two taillights.
Also make certain your fuse is OK, but I'm sure you already checked this.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 221K, 88 744GLE- 202K, 91 244 181K, 88 244GL 145K
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