Abstract: A system for controlling electrical demands on a vehicle battery in a vehicle is provided. The system includes a power conduit adapted to be coupled between the vehicle battery and one or more pieces of aftermarket electrical equipment deployed within a vehicle having electrical systems powered by the vehicle battery and a power manager. The power manager includes a timer circuit operatively coupled with the power conduit and a hardware selector operable by a user for controlling a timer value of the timer circuit, the system being operative to shut off delivery of electrical power through the power conduit to selected aftermarket electrical equipment in response to an elapsed time exceeding the timer value of the timer circuit.