The Curt trailer wiring harness, part # C55339 Is installed to the factory wiring harness connector located on the driver's side of the back of your 1992 Trooper. The connector should be attached to a grommet between the rear wheel well and the bumper on the exterior of the vehicle. It may also be near an exhaust pipe.
With the vehicle is older it could be covered with dirt and tough to find. view full answer...