Trailer Wiring Harness Installation - 2012 Kia Sorento How to Install a Trailer Wiring Harness on a 2012 Kia Sorento. Today on our 2012 Kia Sorento, we will be installing the Curt T-Connector Vehicle Wiring Harness, part number C56163. We'll start our installation by gaining access to the back of the vehicle. Then we will need to remove both tail lights by removing the two screws that hold them in 2012 Kia Sorento Trailer Wiring | etrailer Call 800-298-8924 to get Expert Service ordering a Trailer Wiring for your 2012 Kia Sorento. Complete installation instructions and lifetime technical support on all Trailer Wiring purchases. Lowest price guarantee on accessories for your Kia Sorento and the fastest shipping available.