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 - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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