Where did you test for voltage? That motor uses polarity reversal so if you connect a meter at the motor leads and push the window switch it should read battery voltage one way and reversed polarity battery voltage the other. If it does you can test the motor the same way, use a couple jumper wires from the battery, it should move one direction with the leads connected, then the opposite direction if you reverse the power feeds.
If that checks out then I would suspect that the switch or the wiring has an issue and is not allowing the proper amount of current through. That is where a VOM has a downfall, it will tell you that there is voltage but it cannot tell you if the circuit can carry enough amperage to make the window work.
To test that is not hard. Go find an old headlight bulb and wire it so that you can connect it in place of the window motor. Now try the switch, the bulb will provide a higher load on the circuit. If the bulb barely lights up you have a bad circuit, if the other windows all work okay then the only point for the bad connection would be the switch or its power connection at the switch.
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Monday, August 24th, 2020 AT 12:16 PM
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