Add an Amp Adapter. Use this adapter to make your installation of an amplifier to the factory system faster with a cleaner install. For adding a bass amp for woofer/subwoofer. Adjustable gain output. Prevents cutting factory wiring. Provides rca output and a power wire for the remote amplifier turn on connection. Compatibility Notes: Not compatible with factory external amp stereo systems. Only works with factory non-amplified systems (no JBL/Synthesis, Bose, etc.). Connection is done at back of radio. Works with the following vehicles: No external factory amp vehicles: Made for Ford: 2003-2011 Crown Victoria, 2014-2019 E-Series, 2009-2013 Econoline, 2007-2010 Edge, 2008-2012 Escape, 2004-2014 Expedition, 2006-2010 Explorer, 2006-2010 Explorer Sport Trac, 2004-2012 F150 F-150 (no 2004 Heritage), 2013-2014 F150 (w/CD, No color screen), 2005-2016 F-250/F-350/F-450/F-550, 2011-2019 F650/F750, 2005-2007 Five Hundred, 2009-2012 Flex, 2005-2011 Focus, 2004-2007 Freestar, 2005-2007 Freestyle, 2006-2012 Fusion, 2004-2014 Mustang, 2008-2012 Taurus, 2004-2005 Thunderbird;; Made for Lincoln: 2003-2006 LS, 2007-2010 MKX, 2007-2009 MKZ, 2004-2007 Navigator, 2003-2011 Town Car,2006 Zephyr;; Made for Mazda: 2008-2011 Tribute;; Made for Mercury: 2003-2011 Grand Marquis, 2003-2004 Marauder, 2005-2011 Mariner, 2006-2011 Milan, 2005-2007 Montego, 2004-2007 Monterey, 2006-2010 Mountaineer, 2008-2009 Sable