[Al Skierkiewicz]

Cody and Andrew,
This is an odd case but there is a good way to check out all the possibilities. First, have you tried a different breaker, there are production problems from time to time. Second, disconnect the motor wiring at the output of the speed controller and power up. If the breaker still trips, it is the speed controller or the wiring feeding it (double check the speed controller is correctly wired.). Third, replace the wire between the motor and the controller, using the smaller guage may have melted the insulation between conductors somewhere causing a short. Finally, you could have a bad motor or the mechanism the motor is attached to has a mechanical problem.