I have a 2003 Chevy Monte Carlo that I took the radio out of and put in my 2003 Chevy duramax. A GM dealer unlocked the radio for me but it wasn’t very loud. So I pulled the amp and wiring out of the Monte Carlo also. I have it all wired in the truck even with the Monte speakers. But I can’t get the amp to work. I have power to it and the only speaker working is one in the left rear door I haven’t reworked yet. The door needs replacing and can’t open right now. So, I can’t figure out why the amp won’t work. Do I need the radio reprogrammed or am I missing something? The only wire out of the amp not hooked to anything is the white antenna wire. Help Pleas!!