Abstract: The harness system adapts to a first type of vehicle having a tail ledge with right- or left-had drive and a second type of vehicle having no tail ledge with right- or left-hand drive. The harness wiring is so arranged that a front harness and a combined harness integrating floor harness and rear harness can be commonly used for these four types of vehicles. Only a combined harness integrating cowl harness and instrument harness is differently wired for the right- or left-hand drive vehicle. The front harness and the two sets of combined harnesses are connected to one another through a connecting means located on the same side, either on the right or left side of the vehicle.