Ok, i noticed this the other day when i had to move a trailer at work to do an inspection on it, i didn't have any brake lights. so i know from another experince that there is a 20 amp fuse under the hood so i replaced it. this was last week. this week i check them and to my surprise, no brakelights again. So i put another fuse in. checked in a day or two, it's blown also. turn,tail, they all work, just no brakelights. my truck has the factory trailer hitch and plug. i haven't done anything to the tailight bulbs. I am in need of some advice on this one. Could it be the brake switch? any ideas? :{