ok guys/gals, my dad has a 94 silverado! brake lights aren't working, tail lights work, signals work, just no brake lights! on the right side signal, when head lights r on, the right signal blinks like double time! we have changed the brake light switch, nothing happened, checked with the volt meter thingy on his old 1, & it was good according to the volt meter, pretty sure he has checked the bulbs! is there a ground problem, wiring harness connection, anything, any kind of help would be nice! thanks, carl!