An electrical connector assembly includes a header having a body having a first receptacle and a second receptacle separated by a midwall and a plurality of contacts held by the midwall. The contacts have first pins located within the first receptacle and second pins located within the second receptacle. A first plug is received in the first receptacle. The first plug includes a housing holding a plurality of terminals terminated to corresponding wires having sockets mated with corresponding first pins in the first receptacle. The sockets are configured to be electrically connected to sockets of a second plug received in the second receptacle by the contacts held by the header.