Abstract: A method and apparatus are disclosed for enabling an existing wire supplying DC current to an electrical load of a vehicle to serve as a clean line for transmission of a data signal without interference from electrical systems of the vehicle. The method comprises identifying opposite ends of the existing wire, cutting the wire at the opposite ends and inserting a respective inductor in series with the wire at each of the opposite ends, to define an intermediate wire section that extends between the two inductors, and coupling data transmitting and receiving units to the intermediate section of the wire to permit data transfer between the transmitting and receiving units.