Check fuse #5, 15amp in the inside fuse panel. In the fuse box in the engine bay look at fuse fuse #13 20amp.
If you look on the backside of the fuse panel cover it will show you the fuse location.
2002 - XLT, 4.0L, 4x4
3" BL, 295 Nitto Terra Grapplers
K&N FIPK, Dual exhaust