the truck has the harness for the three radio plugs the third (sub wiring) was taped to the main.I have read that it should be under the rear seat drivers side but I cant find it there. Is there anywhere else they might have ran it to or taped it.The HU is out of an 08 Mustang does anyone know if this radio would sound better with two 8" subs and two amps like the Mustangs have from the factory. Or one 10" or 12" aftermarket sub and amp. I'm not sure on the wiring either way I go.Ive been looking for wiring diagrams that show a good break down but have not found any going from rear of radio to sub any help would be much appreciated