Why does my 2-wire window lift motor only run in one direction?
The vehicle may have faulty wiring or a defective control switch. Most 2-wire window lift motors depend on a voltage polarity change to control direction. If the motor runs in one direction but not the other, the problem is most likely in the wiring or switch. On some older GM applications, the ground is always applied to the motor body, with direction switching being controlled by which of the two pins receives voltage.
My window lift motor is moving slowly, binding and is very noisy when operated. What could be causing the problem?
Dry or worn weather-strip and tracks, dirty switch contacts, or damaged window regulator could be causing these problems.