My headlights have quit working on my 1994 Chevy 1500 pickup. I replaced the headlight switch but they still don't work. The parking lights come on but not the headlights

Try checking both a; your fuses, and b; check your bulbs. You should have two fuse boxes, one under hood and one in or under the dash. Check those for bad, blown or weak fuses. And check your headlights bulbs for them being good and their connection. If this doesn't fix your problem, you may check out your highbeam switch.