I have a 1995 Chevy Silverado two door 2 Wheel Dr. with a 5.7 L V-8. I am having problems with my tail lights and brake light staying on together. Brake lights will not work at all until I turn on running lights or headlights then brake lights and tail lights are illuminated together. Weird thing is that my third brake light on the cab still works just like it should. Does anyone have any ideas or suggestions?