Well, a new motor is always going to be better than a rusty used one, but at a cost! If your old motor runs OK, I would use that with a new resistor.
Trace the red and black wires that go to the motor itself to apply 12V across them. One goes to a relay inside the control box, the other to one of the plugs. If you have a multimeter, you can check the continuity first. Using a spare battery is always preferable to one installed in a car!
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