a first power source;

a second power source;

an interlocked contactor comprising a pair of contactors interlocked via a mechanical interlock and an electrical interlock, wherein the interlocked contactor is in a configuration of a reversing contactor but lacks a crossover bridge for crossing over alternating current (AC) phases;

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;

one or more direct current (DC)/DC converters coupled to both the first power source and the interlocked contactor and configured to provide power at proper output voltages to the parade float when the first power source is selected;

one or more AC/DC converters coupled to the interlocked contactor and configured to couple to the second power source and to provide power at the proper output voltages to the parade float when the second power source is selected; and

an additional interlocked contactor coupled to at least one DC/DC converter of the one or more DC/DC converters, to at least one AC/DC converter of the one or more AC/DC converters, and to the selector switch.