Can someone tell me what I am missing. No fuse blown,bulbs are good and new, just changed the brake light switch...Still no brake lights! Before I start test lighting every wire am I missing a relay or something. All other lights work just not the brake lights.By the way it's a 2003 f250. Thanks

 

Is it a new switch you are replacing or also used? Have you tried bypasing the switch and tuch wires direct to see if the lights turn on?
if they turn on then could just be a bad switch.

 

Sounds like a issue I had with my 1992 silverado. It turned out to be a white wiring harness, with about 6 to 10 wires in it, that was located on the sterring cloumn, a wire that had broke into.