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Both other posts have good ideas.
Here's what happened to the right outside headlight on our '88 745 GLE.
My daughter went for an inspection sticker and got one easilly. The next day she told me a headlight was out. I got a new one and went to replace it and found out that it was unplugged.
I was surprised because they are quite hard to unplug. I connected it and found it was out, then I tried the new one - not working either.
What I figured happened was that the inspector found it out, but also found that a new one did not work, then he decided that he did not have time to fool around, so he gave up and forgot to plug it in.
After some troubleshooting, I then soldered in a new plug, noting that the copper strands were quite black and hard to clean. The repair did not work. I cut the wires back a foot or so and found that the copper inside the wire was very corroded.
I went to a pick & pull and took about 4 feet of harness out of a wreck. When I cut the old wires back 4 feet and spliced in the replacement, the problem was solved.
Your brick, like our '90 744 TI (we sold the 88) is probably going to suffer some electrocal corrosion and ground issues. Recently our '90 stalled whenever I put on the high beams - It was in the FAQ!!! Bad ground in the left front fender. The high beam was sucking up all the ground available and there was none left to run the power stage.
Once I cleaned the ground, everything was OK. My favorite 740 tech told me to clean and apply dielectric grease to all grounds and connectors that I could, and to put on a zip-tie to hold all connectors together.
I am doing this, one connector each week so that if something acts up, I'll know which one it is.
I'll bet that your brick needs the same treatment. It is not really difficult and will give you some satisfaction as you bring your brick into better health. Good luck.
--
'96 855R, 95 855, '95 854, 90 744TI 377,000 miles on 7 bricks
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