Headlight fuse on 1990 Chevrolet 2500 Pickup

Both headlights on my 1990 2500 PU won't come on. I have parking lights but no headlights. I can't locate the fuse for just the headlights. Previously if I went to turn on the highbeams the headlights went dark.

1 answer
If you still haven't fixed this yet I know what it is. My truck did the same thing to me last night. I have a 92 Chevy 2500. All you need to do is replace the light switch in the dash panel, I picked one up from Autozone for $13 or the dealership priced me one at around $45.