2005 gmc sierra stereo wiring

you have to bypass the bose amo if youre going to add a aftermarket deck...........take the  cup holder out the one next the the counsole......there should be some wires twisted....running in pairs,,,or remove the counsole back part which is easier if you are running amps....the rear left spekers wire are twisted, its a yellow and brown, use the brown as + the rear left  speaker wires are two blue ones a darker and a light , use the darker for +...the front right are two green ones the lighter one is the +  and the front left is a gtan and gray ...use the gray for the + ..........!!!!!almost forgot....if you pull out the factory head unit,,,,their should be a harness to the lower right side of where the rear of the radio sits,,,,,it should be held on by a clip pull it out and disconnect it go to your local stereo shop and get a harness...if they carry amp of america parts should be a bha2003

or if they carry american international.....gwh-416