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 GM 1995-2002 models. This harness is designed to retain the oem amplifier when the aftermarket radio is installed.