Kussmaul Electronics Co. Inc. 091-167-12, Load Manager 1HP, is a compact, encapsulated load manager, that monitors the battery voltage, and operates a 75 ampere relay to de-energize a load when the voltage drops. With the engine running, and battery above 12.8 volts, the relay contacts are closed, and power is supplied. With the engine stopped, the loads on the battery will decrease the battery voltage. When the voltage drops below 11.5 volts, the relay contacts open to prevent complete discharge of the battery. A connection to the vehicle's starter prevents opening of the relay contacts during cranking, when a low voltage is expected.