Abstract: An electrical connector assembly for a tractor-trailer jumper cable has an outer connector housing with an internal block of terminal cavities that is recessed to provide cylindrical sockets in each end of the outer connector housing. Each cavity receives a lead terminal and a lead seal attached to an end of one of the insulated leads of the jumper cable. A terminal position assurance (TPA) device having an integral clam shell strain relief is plugged into the socket at the cable end of the outer connector housing to make sure that the lead terminals and lead seals are properly positioned and to provide a strain relief for the cable. A disposable transition connector is plugged into the socket at the contact end of the outer connector body to seal the contact end and protect the cable terminals against corrosion.