im wondering if add ons(upgrades) will work if not original equipment? i bought the truck as a sle but the owner started adding slt equipment. most works but in particular the power leather seats arnt. (he has passed on so i cant ask him how far he got) the moving parts work but the heating(!!!!) and the 2 different driver position settings wont. is there a way i could get them to work? at least the heated seats.....its freezing my butt off!!!! if i cant get it to work as if it came stock i would be willing to throw a switch on the dash but i dont know which wires on the seat harness to hook up to.