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By running 12 volts directly to the wires to the motor the window works both up and down.
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So you powered the motor directly........should take a test light and attach it to the end of the harness that plugs into the motor, and operate the switch in both directions......if it doesn't light at all, then ground the test light and attach to one leg of the harness and operate the switch up/down...should light in one direction......do the same for the other leg......should light in one of the directions(one will light on up, and the other on down)......if nothing or only one leg lights, check the continuity of each leg from the motor to the switch...if both ok, then it's the switch......