Ford F150 - brake lights

2005 f150 stx 4x4 need help no brake lights..checked fuses bulbs relayes etc.. third brake light WORKS (over rear window)checked brake lights with light tester no power. all other lights work blinkers flasher etc...no power to brake light side of trailer light hook-up any thoughts please help

I would take it in. sounds like there is a short under the cab and bed. if you dont see exposed wiring then take it in for them to find. $400 rewired my wifes cougar and havnt had a problem since.

Sounds like the Multifunction switch.