Absolute AWH240 GWH344/70-1858 Wiring Harness Connects an Aftermarket Receiver to Factory Plug on Select 1988-2002 General Motors Vehicles Plugs into car harness at radio Power/4-Speaker ; 21-Pin plug Used for Installing an Aftermarket Receiver to factory plug Allows for the installation of an aftermarket radio using the existing factory wiring and connectors No need to cut or splice in factory wiring