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Did you pop open the switch and file the contacts? The silver contacts get so pitted that they simply won't conduct. A small file is a great tool for this. Also, try swapping the switches in your driver's door- swap that one for another that works, to verify if it's a switch or maybe the motor.
The window motor can get corroded internally and fail, and I've replaced one rear 740 door motor for this reason. ('88 744)
Good luck!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 229K, 88 744GLE- 218K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 88 245DL, 246K
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