Got home this evening and backed into my drive way as usual but had no backup lights. I checked the fuses and #5 under the hood was blown. Changed the fuse and same results. Replace fuse, crank truck, blow fuse. Nothing has been changed or done to the truck. Checked trailer wiring, rear taillight, nothing found. All suggestions welcomed.

 

Is it an auto trans? If so, check the MLPS, that is what tells the b/u lights to turn on.