I've got a 100 Watt Radioshack MegaPhone PA and was looking to put it in my 07 Mustang, I'm not having trouble finding a spot to put it (I cut off the outside of the PA), but I was wondering if I was wiring from PA-CB-Battery, or should I wire it PA-CB-Fuse Box? I wired my 2 10's ages ago and am...