[Will71]

I just had the lights working that morning. Changed the brake line that runs from front to back along the frame.. after that, no lights. weird part is, even the front markers don't work. only lights I get when I turn them on, is headlights.
No dash Lights, no markers, no blinkers, but my 4-ways work. brakes lights work.
I have checked EVERYTHING from bulbs to every fuse on the truck, under dash fuses, power dist. box, wires running to the tails. all the bulbs. I couldnt find Anything that should be causing this. My boss says he believes it could be the actual headlight switch. but to my knowledge, I checked everything.. but any ideas, throw em this way.