Found the problem. I pulled the stop light switch(brake light switch) and opened it up. the connectors that get pressed together to make contact, where corroded. Inside the switch there are 6 metal connectors, 2 witch make contact with each other, when the brake pedal is depressed. I Cleaned them with some sand paper and reassembled/installed in the truck. Wallah... I have brake lights. I could of easily replaced the stop light switch but this saved me $10 and a trip to the parts store.