This is to funny i know everyone starts somewhere,but its really just common sense.Heck its even wired up for you

take that gray plug,plug it in to the harness from the factory HU

now that other plug goes back into the stock hu where ever you mount it

and that black plug goes to your new HU

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2001 Chevrolet Cavalier
www.cardomain.com/id/black_z24_14

2003 GMC JIMMY SLS
www.cardomain.com/Id/Jimmys4life