When replace the OEM radio with an after market radio this harness provides a simply solution to connect the after market radio to the OEM harness. Harness directly plugs into the OEM radio harness . Our harness follows the E.I.A. color code standard so matching the wire to the after market is easy and makes is plug and play . Plugs into Car Harness at radio and Designed for Ford 1989-2000 models. To be used as a jumper bypassing the factory amplifier.Plugs into pre-amp harness and into speaker harness at amp.