Expand the factory sound system without replacing the factory radio, by adding an amplifier. The AA-GM44 “T-harness” plugs into the vehicle’s wiring behind the factory radio providing a 4-channel adjustable audio output via two sets of stereo RCA connectors. Delivering simple and quick audio connection to an aftermarket amplifier, without affecting the performance of the stock speakers. Simplify the installation by using the AA-GM44 to provide the audio signal without having to cut the factory wiring. Vehicle Compatibility 2012+ Avalanche, Sierra, Silverado Suburban, Tahoe & Yukon vehicles equipped with a non-navigation radio require the AOEM-GM1416 Not compatible in vehicles with premium factory amplified systems Application Guide BUICK 2010-2012 2011-2012 CHEVROLET 2012-2013 2010-2012 2011-2012 2010-2012 2012-2013 2012 2012-2013 2012-2013 GMC 2012-2013 2012-2013 2010-2012 2012-2013 2012-2013 CADILLAC 2010-2012