A connector assembly of the type including a first housing with terminals therein, and a second housing receivable within the first housing with terminals therein adapted to mate with the terminals at the first housing. Both housings are relatively moveable in the first direction with respect to one another between an initial position wherein the second housing is initially received in the first housing and an inserted position wherein the second housing is fully inserted within the first housing so that the terminals of the respective housings are in mating engagement. The improvement includes a generally rectangular-shaped actuator member reciprocally mounted in the first housing with cam slot means formed therein. The actuator is reciprocally moveable in a second direction generally transverse to the first direction between an unlocked position and a locked position. The housings are moved in the first direction to the inserted position in response to moving the actuator in the second direction to the locked position.