Abstract: An electric drive apparatus for attachment to a swing away auger assembly includes a bracket and drive wheel adapted to be attached to the assembly and configured to pivot an attached swing auger. An electric drive motor rotates the drive wheel, and a control circuit assembly is connected to the electric drive motor by drive wires. The control circuit assembly is operative to activate the electric drive motor in response to forward, stop, and reverse drive signals received from a remote control unit. The control circuit is mounted to a heat sink plate such that heat generated in the control circuit assembly is conducted to the heat sink plate, and the heat sink plate forms an external wall of a circuit housing enclosing the control circuit assembly. The circuit housing is sealed. A bin spill prevention system has a sensor that shuts a discharge gate directing material into the conveyor.