Abstract: A power system for a parade float includes a first power source, a second power source, and an interlocked contactor. The power system also includes a selector switch coupled to the interlocked contactor, wherein the interlocked contactor is configured, in response to selection of a power source from among the first power source and the second power source with the selector switch, to switch between the first power source and the second power source for outputting power to the parade float with the selected power source.

Abstract: A charge interlock system of an electronic device includes a drive system, a relay coupled to the drive system, and a controller. The controller receives an indication that the electric device is in a charging mode. The controller also transmits signals to open the relay. Moreover, the controller determines that the drive system is disabled based at least in part on the open relay.