Abstract: A harness assembly comprises a plurality of wires and a positioning part formed around the wires by means of molding. Each wire comprises an extension section and a naked section provided at a first end of the extension section. Each extension section comprises at least one core conductor and an insulative sheath covering an outer periphery of the at least one core conductor, the naked sections formed by baring and exposing the core conductors outside and are capable of being soldered to soldering pads of the circuit board. The positioning part comprises a main body portion formed around the wires by means of molding and two positioning legs provided on the main body portion in an asymmetry manner, the naked sections of the wires are arranged between the two positioning legs. The first positioning leg corresponds to the first positioning hole of the circuit board, and the second positioning leg corresponds to the second positioning hole of the circuit board.