Stereo Wire Harness Mercury Cougar 99 1999 00 2000 (car radio wiring installa. Aftermarket Radio / Stereo Installation Wire Harness Connection of Wire is Plug N Play - Plugs directly into vehicle harness (no cutting or splicing) Professional wiring harness (EIA color coded to match the aftermarket wiring) IF YOU CURRENT CAR RADIO STAYS ON AFTER THE KEY IS REMOVED (BEFORE DOOR IS OPENED) THIS HARNESS WILL NOT WORK PROPERLY