I have a 2006 kia sportage and there was a trailer wiring May 22, 2011i have a 2006 kia sportage and there was a trailer wiring harness installed on it i am trying to get it to work not sure which wire is for the ground? i have a tester and the tail light diode is lit. and the left and right turn signal diodes are dimly lit. the harness had a 3amp fuse that burned out over the winter i need help!! 2019 Kia Sportage Hitch Wiring | Harnesses, Adapters Get your 2019 Kia Sportage outfitted to electrically connect to any trailer. Towing is simplified with our selection of harnesses, adapters, and connectors. 2019 Kia Sportage Hitch Wiring. Plugs into vehicle tail light assembly to provide a 4-way flat socket Simple plug-and-play design eliminates the need for cutting or splicing. $68.