Kussmaul Electronics Co. Inc. 091-141, Load Manager P, is a precision low voltage disconnect, designed to shut down a radio, or computer, to prevent complete discharge of a vehicle's battery. In addition a timer is provided that will shut down the load 1 to 2 hours after the engine is stopped. This permits an operator to use the radio for a period of time, after engine shutdown. Yet protects the battery, if the operator forgets to turn the radio "OFF". An over-ride input from the starter, prevents de-energizing the load, due to low voltage, which may occur during engine "cranking". Easily installed, this Load Manager is ideal for police cars, and emergency vehicles.