Just posting some additional info since on my search for "taillight connector" I couldn't find the part number.
If your connector is melted and needs replacement here are the part numbers:
Part # and Description List Price
12-52-7-519-956 Housing $3.60
61-13-1-387-144 Plug $0.72
The housing is the tail light connector housing and the plug is what you attach to the ground wire and put into the housing.