Dual Function Tow Mirror Wiring Harness (Running Light This kit converts the lights on your 2015+ style GM tow mirrors from signal only to dual function running light and turn signal. Fits Chevy GMC Silverado Sierra towing mirrors from 1988-2018. FREE SHIPPING and MADE IN USA. This kit is easy to install and includes a full installation video. 2014 - 2018 GM Plug and Play Tow Mirror Wiring Harness Make all features on 2014+ tow mirrors work plug and play without having to buy costly harnesses ($300+) from GM. Works on all GM tow mirrors for Silverado and Sierra 2014 to 2018. Full install video and FREE SHIPPING. Get your towing mirrors working properly today. Running light, signal, cargo lights, and power fold.