• Not sure, but you may not have a good ground if the new motor was painted. I've run across this problem with various DC items. Most automotive electrical parts depend upon their mounting screws to act as "ground" (negative), and the only wires coming "in" are hot (positive voltage) wires. DC automotive motors are usually internally grounded and depend on a good metal-to-metal contact to from the motor housing to the car's metal frame (or attaching point) to complete the circuit. A quick way to find out is to attach a wire to one of the motor's screws and route it to the frame or other metal part which connects to the frame, then try it. If the motor then runs then it's a grounding problem and all you need to do is remove the paint from the mounting screw holes.

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