Last time I was on here (1 yr ago) I had asked what wiring harness to use on my car which has OnStar and Monsoon amp/radio. I had many answers, but none of them worked. I tried GMOS-09, and it didn't work. Was wondering if anyone found a harness that worked with my car that I don't have to cut or put in a wire to another pin. I just want to be able to hook it up without any adjustments to the harness. Any help would be great. Thanks