Banjoman, Look at the schematic and text from shop manual published in this thread. The motor's cases are grounded to the vehicle frame and the motors themselves have two sets of windings, one for up and the other for down. Working the window switch puts 12 volts one set of windings or the other. Do like has been recommended and first run a dedicated ground from the battery negative terminal to somewhere on the motor's case/housing. Hook the switch pigtail to the motor and try it. If the motor works, you have a ground problem. If it does not work, you do not have an adequate supply of power to the motor. In that case, run a wire straight from the battery plus terminal and touch it to one motor terminal at a time. It should run. This proves that the motor is good and that the problem is in the vehicle circuitry.
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