Abstract: A test adapter plug for connecting a solid wire conductor to a wire-wrap terminal post includes an elongated insulating housing having first and second openings respectively dimensioned to conform to the terminal post and the solid wire conductor, with the conductor opening accommodating passage therethrough only of the bare wire and not the insulation thereon. The housing contains two spaced-apart electrical receptacles interconnected by a conductor or a circuit element, such as a diode, each receptacle having a pair of spaced-apart spring contacts with the pairs of contacts respectively disposed adjacent to the two openings in alignment therewith for receiving and electrically contacting the terminal post and the solid wire conductor. The housing carries a strain relief member adjacent to the conductor opening for receiving the insulated portion of the conductor.