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This is the same type motor frequently used in automobile windows. After 30 years of electrical maintenance work, I have seen this many times before. In Factories and in cars. Automotively the test is to hit the door panel with a dead blow hammer and see if it starts working. There is a possibility that the brushes in your motor have simply stuck or they are worn to the point they are no longer making contact except for arcing across from the brush to the commutator inside the motor. 1 quick test is to use a small hammer and tap close to the mounting end of the motor. Not hard enough to dent the case, but enough to let the brushes make contact. Then test the slide again. If it starts working it will almost always be a stuck or worn out set of brushes. They will be replaceable but can be tricky to hold them retracted while reassembling the motor. If the motor runs after tapping on the housing the motor should be opened and the brushes checked as continued use could cause arcing to the commutator of the motor, then the entire motor would have to be replaced. Brushes are designed to wear.
Hope this helps, Terry
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