A method of operating a transport refrigeration system is provided. The method includes controlling, using a controller, a first plurality of components of a refrigeration unit, wherein controlling comprises operating a prime mover and an electric generation device. The method also includes operating, using a controller, the prime mover at a selected high speed. The method further includes monitoring, using a controller, a plurality of operating parameters of the refrigeration unit, wherein at least one of the operating parameters is at least one of a voltage of the electric generation device and a speed of the prime mover. The method yet further includes comparing, using a controller, the voltage of the electric generation device to a selected voltage. The method also includes comparing, using a controller, the speed of the prime mover to a selected speed.