An apparatus for monitoring a direct current system for ground faults in a device having an inherent capacitance between the direct current system and a chassis of a vehicle, the apparatus comprising: a fault detection module; a positive node adapted to be connected to a positive terminal of a battery, and a negative node adapted to be connected to a negative terminal of the battery; a first switch connected between the positive node and the fault detection module; a second switch connected between the negative node and the fault detection module; a switch driver adapted to sequentially open and close the first switch and the second switch such that the inherent capacitance is charged and discharged; wherein the fault detection module is connected between a ground connection of the chassis of the vehicle and the first and second switches (110, 116), the fault detection module comprising: a controller for controlling the switch driver; a current sensor connected to the controller; and a data interface connected to the controller, the data interface adapted to output a signal in response to a result calculated by the controller, characterized in that: the current sensor is adapted to sense a first current when the first switch is closed and a second current when the second switch is closed, the current sensor is further adapted to provide current measurements, wherein the current measurements are signals indicative of the amperage of each of the first current and the second current; the current sensor comprises a programmable gain amplifier and an analog to digital signal converter, the programmable gain amplifier is adapted to transmit a signal to the analog to digital signal converter, and the analog to digital signal converter is adapted to transmit a current measurement to the controller. a fault detection module; a positive node adapted to be connected to a positive terminal of a battery, and a negative node adapted to be connected to a negative terminal of the battery; a first switch connected between the positive node and the fault detection module; a second switch connected between the negative node and the fault detection module; a switch driver adapted to sequentially open and close the first switch and the second switch such that the inherent capacitance is charged and discharged; wherein the fault detection module is connected between a ground connection of the chassis of the vehicle and the first and second switches (110, 116), the fault detection module comprising: a controller for controlling the switch driver; a current sensor connected to the controller; and a data interface connected to the controller, the data interface adapted to output a signal in response to a result calculated by the controller, characterized in that: the current sensor is adapted to sense a first current when the first switch is closed and a second current when the second switch is closed, the current sensor is further adapted to provide current measurements, wherein the current measurements are signals indicative of the amperage of each of the first current and the second current; the current sensor comprises a programmable gain amplifier and an analog to digital signal converter, the programmable gain amplifier is adapted to transmit a signal to the analog to digital signal converter, and the analog to digital signal converter is adapted to transmit a current measurement to the controller. a controller for controlling the switch driver; a current sensor connected to the controller; and a data interface connected to the controller, the data interface adapted to output a signal in response to a result calculated by the controller, characterized in that: the current sensor is adapted to sense a first current when the first switch is closed and a second current when the second switch is closed, the current sensor is further adapted to provide current measurements, wherein the current measurements are signals indicative of the amperage of each of the first current and the second current; the current sensor comprises a programmable gain amplifier and an analog to digital signal converter, the programmable gain amplifier is adapted to transmit a signal to the analog to digital signal converter, and the analog to digital signal converter is adapted to transmit a current measurement to the controller. the current sensor is adapted to sense a first current when the first switch is closed and a second current when the second switch is closed, the current sensor is further adapted to provide current measurements, wherein the current measurements are signals indicative of the amperage of each of the first current and the second current; the current sensor comprises a programmable gain amplifier and an analog to digital signal converter, the programmable gain amplifier is adapted to transmit a signal to the analog to digital signal converter, and the analog to digital signal converter is adapted to transmit a current measurement to the controller.