I have a 2000 silverado k2500 with the 7.4 liter and the old body style like the 98 or 99. My brake lights just stopped working. The third light, signals, and flashers are all fine. Twice ive fixed it (though im not sure how) and both times the next morning they wont work again. Replaced pedal switch and signal switch already and im getting power to my relay. I know the relay is good but somewhere after that im losing power. When I replaced the signal switch last night they worked fine. I walked away from the truck for a minute came back and they had stopped again. Im not even getting power to the plug next to the frame in the back.