Abstract: A contact retaining clip is fixed in an insulator cavity by the use of discontinuities around the clip which can be wedged or embedded in the insulator. Preferably a probe is inserted into the clip to expand it. The clip and/or the probe may be heated prior or during insertion or by heating after insertion of the clip but before expansion of the clip.

Abstract: An electrical connector having means providing a signal when the connector members are fully interengaged. The signal means includes a pair of contacts in the two connector members which are axially spaced apart a distance greater than that of the power contacts in the two members so that the power contacts will become electrically coupled prior to the signal contacts when the connector members are mated. The signal contacts are preferably fixedly mounted in the connector insulators and conductors are releasably coupled to the rear portions of such contacts.

Abstract: An electrical connector to act as a switch and to provide a fail-safe closure or open indication of a cargo door, wherein first and second telescoping tubes carry a socket and a pin, respectively, and one of the tubes is loosely mounted from the door or a fixed structure in a ball and socket joint.