Mopar Trailer Wiring Harness 7-Way Jeep Wrangler JL 2018-2019 Mopar 7-Way Trailer Wiring Harness for 2018-2019 Jeep JL Wranglers. Mopar designed this 7-Way Trailer Wiring Harness (82215398AB) specifically for your 2018-2019 JL Wrangler. This harness has a seven-four way connector that reduces the need for wire splicing.Price: 299 Mopar 7 pin wiring harness issues | 2018+ Jeep Wrangler wwwanglerforums›Forums›Technical SectionsNov 22, 2018I’ve got a 18 JLUR with steel bumpers and LED lighting packages for reference. I installed the Mopar 82215896 wiring harness this weekend. Install took time but went pretty easy. All connections look good. The problem I am having is I’ve got only 12v power from the red wire at the 7 pin connector. Absolutely nothing else.