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A Note About the Ground Wire
Cut the connector if you don't need it.
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.