Hi I'm new here. I have a 2019 ram 1500 bighorn with the alpine 9 speaker sound system. I am trying to add a 12 inch alpine type r and a Rockford fosgate 1200d amplifier to the factory alpine system. I'm having a tough time finding a working diagram to figure out which wires to tap my pac lp7-2 loc into. Has anyone done this or know how to do this? Any help would be greatly appreciated!