Description??This wire harness provides a connection for one set of RCA cables to provide an audio signal to an external amplifier. All that??s left for you to do is connect the main power wire from your battery and ground to the amp! (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 your factory radio2. Unplug the factory wiring and plug in this wire harness3. Reinstall your factory radioConverter adjustment instructions:After completing all of the necessary connections, turn the adjustment pots all of the way down by rotating them completely counter-clockwise.Turn the stereo system on and adjust the main volume control on the stereo to approximately 3/4 maximum volume.Select one of the adjustment pots and turn it slowly clockwise until you notice audio distortion and then stop.Turn the remaining pot to the same position as the previously adjusted pot.Package Including??One (1) plug and play wire harness