04 tahoe aftermarket hu w/bose amp

I've been reading post on here and haven't seen any with installing just the headunit with the factory amp. I just spent 6 hrs ripping apart my friends tahoe trying to find out how to connect the rca's to the amp. We have everything else hooked up all thats left is the speaker wire coming out of the aftermarket deck harness and Rca's coming from the other end of the wireing harness i guess i really needs some help. I'm installing the Kenwood DDX-7017, cant figure out how to wire the Rca's or what they need to be wire to or if i need to wire the speaker wire from the head unit to the Rca's. I'm lost in this area please help confussed on what to do next and how to do it.  

i got the gmco harness from peripheral electronics

his truck only has the bose speakers and the amp

You should not need to run any thing to the actual amp. Everything should be done on the harness.  There should be a remote turn on on the gmco harness and that needs to be connected to the blue./white off of the aftermarket deck.  If there is not one one the gmco then  the factory amp turn on wire is the pink wire on the factory radio plug. (the plug that the gmco should already be plugged into). You could wire the remote from the deck right to that wire .