Can't get my amplifier to work.

Question

I have a 99 GMC Denali I had a local store hook up all the stuff to adapt from bose system to a after market CD player a Alpine model# cda-9827 and I put a sony 1200 watt amp in to.My problem is I can't get the amp to work or push the subs.I've did everything.I also noticed when I un hook the rca the subs where still leting the sound from the radio come through.It's driving me nuts i really need help please....