Install a New Car Stereo

Many car stereo wiring harnesses will have a screw type connector at the end of the ground wire. If for some reason your current stereo was not grounded through a wire (the diagram on the back of the wiring adapter kit will tell you) you can ground the car stereo by finding a screw under there to attach this wire to.

If your car is like most and has a ground wire for the car stereo already, just cut the connector off and crimp it to the adapter harness.