Description: This wiring harness allows you to connect one set of RCA cables to feed the audio signal to an external amplifier. All you have to do is connect the main battery power and ground wire to your amplifier! (Not Included) Fitment: 2015-2018 GMC Canyon 2019 GMC Sierra 1500 Limited, 2500 HD, 3500 HD 2015-2018 GMC Sierra 1500, 2500 HD, 3500 HD 2015-2017 GMC Sierra 1500, 2500 HD, 3500 HD 2014 GMC Sierra 1500 2014 GMC Sierra 1500 2015-2020 GMC Yukon, Yukon XL 2015-2020 GMC Yukon Denali, Yukon XL Denali Installation: 1. Remove factory radio 2. Disconnect the factory wiring and connect this wiring harness3. Install the factory radio in placeInstructions for setting up the converter:Once all necessary connections are complete, turn the adjustment potentiometers all the way down by turning them completely counter-clockwise.Turn on the stereo and adjust the main volume control on the stereo to approximately 3/4 of the maximum volume.Select one of the adjustment potentiometers and slowly turn it clockwise until you notice distortion in the sound, then stop.Turn the remaining potentiometer to the same position as the previously adjusted potentiometer.Included in the kit:One (1) plug and play wiring harness