Abstract: An adapter member for connection to the top or bottom surface of a molded plastic traffic signal housing and adapted to be connected to the outlet of a wire entrance fixture, said adapter member comprising a rigid body having a top, a bottom, and a passageway through the body from the top to the bottom, said body adjacent the passageway at the top being shaped to mate with the outlet end of the wire entrance fixture so as to provide 360.degree. rotational positioning of the body with respect to the fixture, said bottom of said body being shaped and adapted to be fastened to extend over the major portion of said top or bottom surface of said molded plastic traffic signal housing.