hopefully some can help me out with this one....I have a 1995 gmc 1500 short bed...with the key off I can push brake pedal and I have brke lites....turn key on and the brake lites come on and when I push the pedal they go off...I have replaced the brake switch, multi function switch and the ignition switch and it still does the same thing...I have had the dash apart and can not find any cut, spliced and bad wiring...I have checked and cleaned all grounds....any ideas on what the problem can be ?....thanks !