Okay so I managed to find the problem. While replacing all of the 15 amp fuses, I stuck one in and swore I heard the fuel pump turn on, as well as a clicking noise from what seemed like the throttle body. I referenced the fuse box cover, and lo and behold, it was the radio fuse. I couldn't for the life of me figure out how this was possible, and then realized the 2 power wires for the radio were tapped into the ignition harness. So I cut the wire that was attached to the pink ignition 1 wire, and VOILA! Truck now shuts off. Gonna have to dig deeper into why there's 12 volts coming OUT of my stereo. If I'm not mistaken, I had to connect the trucks harness wire that goes to the Bose amp to the power wire on the stereo, otherwise I had no sound whatsoever.