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Power path on the trucks depending on polarity is left wheel to bearing to left truck frame to clip to motor to frame to right truck frame to bearing to right wheel. Both trucks work the same way. The wiring recommendations are good practice anyway for Athearn and may cure your problem but I'd still check the path with a spare piece of wire. We're assuming that the truck rolls properly so there is no junk in the gears. <br />Since the front truck is working you can eliminate the motor to frame and return to truck path. <br />One last thought. Are the wheels in gauge? It's possible the wheel halves are out of gauge and are shorting in the spur gear. If set to NMRA specification there wont be a short in this area.
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