An apparatus for charging and discharging an electrical device in a vehicle is provided with a first power source for providing low voltage energy and a second power source for providing high voltage energy. A switch enables/disables the first power source. A first contactor includes a first winding connected to the first power source and a first switch connected to the second power source. The first contactor enables the second power source to provide the HV energy for charging the electrical device in response to the switch enabling the first power source. A second contactor includes a second winding connected to the first power source for receiving the LV energy and a second switch connected to the second power source for receiving the HV energy. The second contactor is in an open state in response to the switch enabling the first power source.