If you are going to use the Factory Monsoon amp ( which you won't like with your aftermarket headunit) then the GMOS-04 is the proper wiring harness to use to wire the radio. this will also maintain all chimes and Onstar.
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09-05-2013
If you are going to use the Factory Monsoon amp ( which you won't like with your aftermarket headunit) then the GMOS-04 is the proper wiring harness to use to wire the radio. this will also maintain all chimes and Onstar.
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