Use this harness to bring the front and rear channels of the amplifier input gain controls into a useful range of adjustment, when setting up and tuning a high-performance Bagger audio system; Plug-and-play Connects the Infotainment radio's rear-speaker-output plug connection on the back of the radio harness to the RCA inputs of most high-powered 12v automotive type audio amplifiers; Note: This rear-speaker output connection point may not be active for certain H-D bagger models until a Harley radio flash is performed to activate the front/rear fader control