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Truck wiring is one side of wheels to the tab, tab to motor, motor to frame and the return is frame to truck frame to other side of wheels. You more likely got something in the truck itself which is either binding the gears or is not allowing the worm gear to make contact. Start with removing the truck and seeing if it move freely. The smallest of debrise can stop it. I've just had to disassemble a rear truck for an Athearn SW1500 which had a plastic chip in there from somewhere.
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