14-15 Sierra SLT to 16-19 HD Headlight Harness roto fab As of December of 2025

As of December of 2025 GM has discontinued the X5 screen cable

6-Mounting Brackets(GM)

Please note that with this harness installed you will lose the ability to have just your parking lights on

Relay can be mounted to a suitable location under the hood

14-15 Sierra SLT to 16-19 HD Headlight Harness roto fab As of December of 2025This is only for OEM headlights not aftermarket headlights. This harness is for those with 2014 and 2015 GMC Sierra SLT models that want to upgrade to the 2016 2019 HD(2500&3500) HID headlights. The 2016 2018 HD headlights look identical to the the 2014 2015 SLT headlights except they utilize a HID bulb for a much brighter and functional look. This harness provides the "clean power" needed to run the GM HID bulbs. For use with these 16 19 HD