The 3rd brake light in my 2007 F150 is not working. I replaced the bulb and put a meter across the wires and get no voltage when the brake pedal is pressed. I have a good ground wire but no voltage coming in on the green wire to the 3rd brake light. The other brake lights work fine. I checked the connections behind the lamp socket and they are solid. I am trying to determine where the wire is coming from where there might be a connection problem but I can't find any wiring diagrams.
Any help would be appreciated.