How do you install a radio in a 1991 Lincoln Mark 7 LSC?

To install a radio in a 1991 Lincoln Mark 7 LSC, first, disconnect the negative battery cable to ensure safety. Remove the trim panel around the existing radio using a flathead screwdriver or trim removal tool, then unscrew and slide out the old radio. Connect the wiring harness adapter to the new radio, ensuring the color-coded wires match, and then secure the radio into the dash. Finally, reattach the trim panel and reconnect the negative battery cable.