Electrical connector with spring for missile launch rail

An electrical connector for testing of a missile launch rail is provided. The electrical contacts of the connector move from a rear disengaged position to forward engaged positions via the energy of a compressed spring. The connector base has rail mounts for securing to a missile launch rail. A housing attaches to the base and houses a plunger, an insulator, electrical contacts, and a tube, which move forward and aft as a unit. A knob on a rear tube end enables a user to limit the initial impact of the electrical contacts on contact pins or striker points of a missile launch rail. The connector can provide electrical connection with launch rail pins as rail pins recede into the missile launch rail. Electrical contact position is governed, in part, by locating pins which ride in a track cut into an outer surface of the tube and move with rotation of an indexing ring.