I'm replacing the dashboard in my 91 gt. Got it all back together and the headlights won't come on. The parking lights, brights, and turn signals work. I replaced the plug and the switch, still the same problem. Any ideas to what might be causing this? Thanks.

 

I gave you the wiring diagram, you need to start testing and tracing all of the wiring going to or from the headlights back to the switch and up into the column to teh high beams.