When diagnosing an electrical problem, it's best to check voltage with the load (the motor in this case) in the circuit. The resistance of your test light is much higher than the resistance of the motor windings, so it's likely to give a false reading if the motor is disconnected. If the switch is bad, it may still be able to light up your tester.
The few door motors I've messed with had two windings and a common return (ground). As others have said, you also need to be sure the motor is properly grounded.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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