Abstract: An auxiliary Powerbox to generate electricity through an additional alternator configuration in an emergency vehicle which reduces fuel consumption and minimizes wear factors associated with idling the engine when the vehicle is at rest and when the vehicle's primary engine is not operating. The system is an auxiliary system that provides electrical power by means of a small internal combustion engine and an alternator and is intended to provide electrical power to a vehicle when the main engine of the vehicle is shut down. The system, the DC Powerbox, has an independent fuel system and cooling system however the fuel and cooling systems could be incorporated into the vehicles respected systems.