A device, comprising: a plurality of field effect transistors, FETs, (107; 235) electrically connected between a vehicle electrical system and a battery and starter circuit; a boost converter circuit configured to provide a gate voltage for the plurality of FETs (107; 235) greater than a source voltage for the plurality of FETs (107; 235) by a predetermined voltage; a fast gate discharge circuit configured to establish a switchable path to ground; and a control circuit electrically connected to the plurality of FETs (107; 235), the boost converter circuit, and the fast gate discharge circuit, wherein the control circuit includes a first state and a second state and is configured to: receive a control signal from an engine control unit, and in response to the control signal being at a first level: turn on the boost converter circuit, and switch the plurality of FETs (107; 235) to the first state, wherein the first state allows current flow between the vehicle electrical system and the battery and starter circuit, and in response to the control signal being at a second level: turn off the boost converter circuit; and switch the plurality of FETs (107; 235) to the second state, wherein the second state allows current flow from the battery and starter circuit to the vehicle electrical system wherein the control circuit further comprises a filtering circuit configured to provide standard filtering, overvoltage protection, overcurrent protection, and reverse battery protection for the vehicle electrical system and the battery and starter circuit. a plurality of field effect transistors, FETs, (107; 235) electrically connected between a vehicle electrical system and a battery and starter circuit; a boost converter circuit configured to provide a gate voltage for the plurality of FETs (107; 235) greater than a source voltage for the plurality of FETs (107; 235) by a predetermined voltage; a fast gate discharge circuit configured to establish a switchable path to ground; and a control circuit electrically connected to the plurality of FETs (107; 235), the boost converter circuit, and the fast gate discharge circuit, wherein the control circuit includes a first state and a second state and is configured to: receive a control signal from an engine control unit, and in response to the control signal being at a first level: turn on the boost converter circuit, and switch the plurality of FETs (107; 235) to the first state, wherein the first state allows current flow between the vehicle electrical system and the battery and starter circuit, and in response to the control signal being at a second level: turn off the boost converter circuit; and switch the plurality of FETs (107; 235) to the second state, wherein the second state allows current flow from the battery and starter circuit to the vehicle electrical system wherein the control circuit further comprises a filtering circuit configured to provide standard filtering, overvoltage protection, overcurrent protection, and reverse battery protection for the vehicle electrical system and the battery and starter circuit. turn on the boost converter circuit, and switch the plurality of FETs (107; 235) to the first state, wherein the first state allows current flow between the vehicle electrical system and the battery and starter circuit, and in response to the control signal being at a second level: turn off the boost converter circuit; and switch the plurality of FETs (107; 235) to the second state, wherein the second state allows current flow from the battery and starter circuit to the vehicle electrical system wherein the control circuit further comprises a filtering circuit configured to provide standard filtering, overvoltage protection, overcurrent protection, and reverse battery protection for the vehicle electrical system and the battery and starter circuit. turn off the boost converter circuit; and switch the plurality of FETs (107; 235) to the second state, wherein the second state allows current flow from the battery and starter circuit to the vehicle electrical system wherein the control circuit further comprises a filtering circuit configured to provide standard filtering, overvoltage protection, overcurrent protection, and reverse battery protection for the vehicle electrical system and the battery and starter circuit.