When replace the OEM radio with an after market radio this harness provides a simply solution to connect the after market radio to the OEM harness. Harness directly plugs into the OEM radio harness . Our harness follows the E.I.A. color code standard so matching the wire to the after market is easy and makes is plug and play . Designed to be used for 2002-2004 Dodge Ram Trucks this harness is used to Bypass the Factory Infinity Sound System in vehicles without the Handsfree capable option.