Wire harness for installing an aftermarket radio. Important: Red wire on wire harness is not used- cap it off. Red ignition wire of the new radio has to be run separately from the vehicle radio harness (factory radio plug has no ignition power wire). Not compatible with factory external amplified systems like Bose, JBL, etc. Only compatible with standard factory audio system with no external amplifier. Will not retain steering audio controls. Compatible vehicles: No external factory amp vehicles: Made for Dodge Truck: 2006 2007 2008 Ram 1500, 2006-2009 Ram 2500/3500, 2008-2010 Ram 4500/5500