Truck electrical socket with enhanced connection capacity

An electric socket assembly is provided having a socket sleeve, an insert disc, a socket cap and a plurality of plug extenders. The insert disc carries a common pin and a plurality of non-common pins on its front face and service connection studs on its rear face. Each service connection stud is electrically connected to a respective pin. A socket cap having a plurality of pockets is positioned over the service connection studs such that each service connection stud extends through an opening in the respective pocket of the cap. A plug extender is positioned in each of the pockets of the cap such that the service connection stud extending through the opening in the pocket also extends through an opening in the plug extender. The plug extender includes plural service connection terminals in conductive relation to the service connection stud to enhance the connection capacity of the socket assembly. The plug extender is secured in the pocket using a fastener which can be a component of one of the service connection terminals.