An electrical management control and monitoring device that easily interfaces with an existing motor vehicle electrical system that includes both “dumb” and “smart” circuits to protect the electrical system during events in which the voltage, current or temperature may change and potentially cause damage or render the vehicle electrically “dead”. The device, which is coupled to the motor vehicle's ignition switch, power source and multiplex bus, includes a motherboard, a microcontroller and software program that monitors the vehicle's capacitor, battery or combination voltage, current and temperature and automatically disconnects non-critical circuits when their values become extreme or reach a preprogrammed threshold. The motherboard includes output connectors that are coupled to solid-state relays that act as a supplemental power source to provide electrical power to components that require electrical power after the ignition has been turned off. The software program is used to prioritizes electrical power distribution to the components which are critical to engine starting, power train control and general longitudinal and lateral control systems of the vehicle.