I'm going crazy trying to find a prob with my brake lights that won't work. The fuses (ALL of them) ok, new switch, new bulbs, no wires frayed or shorted, have all running lights and the cab brake light works, any suggestions will be most welcome. My truck and I work 6 to 7 days a week I can't live like this!!!!!

 

Did you try the contact switch on the brake pedal?

 

Check to see if you have a plug in trailer connector in-line in your harness. I had one in an older Ranger I had. The truck started doing all kinds of stupid stuff in the lights, I un-plugged it and all better...

 

Thanks, I'll give it a try