Hi I have a 94 Chevy K 1500, and I am having some problems with my tail lights. When I turn on my head lights my running lights do not work and brake lights don not work. My back up light do not work either. But when I have my head lights off my brake light and blinkers work, if I press on the brake pedal my blinkers stop working. I have check all the ground and blubs are good. Does anyone have any ideas? If so please help me out thanks.