I was working on the wiring for my trailer brakes when I noticed my backup lights weren't working. So I checked the fuse and it was blown. I bought fuses and replaced them all and now the truck will not start. I turn the key and the only sounds I get are the electric fuel pump and a click from under the dash. The part that is clicking is a relay of some sort (maybe an accessory relay) with a part number of 15B683-AA. I assume this relay is the problem, but I cant find any information for that part number or what the relay is actually for. Has anybody else ever encountered this, if so, what is the fix?