Abstract: A multiwire electrical connector for making electrical connections between the tractor and trailer of a tractor-trailer rig. The connector has two members, each with a set of mating connector elements (e.g., spherical balls and mating spherical recesses). A flange-locking means is provided for locking the two connector members together; one member is pressed against the other along an axial direction, and the members are rotated relative to one another until radially-extending flanges engage flange receptacles. Spring means in at least one member urge the mating connector elements tightly against each other along the axial direction, to assure continuous electrical contact between the connector elements. The spring means also cooperates with the flange-locking means to provide resistance to axial compression of the members toward one another, thereby providing tight, vibration-resistant engagement of the locking flanges and flange receptacles.