Metra Electronics 70-5520 Wiring Harness for Select 2003-Up Ford Vehicles Plugs into car harness.METRA Crown Victoria/Grand Marquis Marauder/Expedition (Late Production) 03 Turbowire 705520 Power/4 Speaker 24-pin connector For select 2003-2007 Ford, Lincoln, Mercury vehicles Allows for the installation of an aftermarket radio using the existing factory wiring and connectors