Headlights not coming on

I've searched for the answer... Haven't found it so far. The automatic headlights in my 98 Blazer don't seem to be working completely. When dark(when I do the majority of my driving) the headlights will come on automatically, but the dash lights and tail lights don't come on. I know the actual HLs are coming on not just the DRLs because I can switch from high to low beam. It's a luxury thing that I've gotten used to and want it to work again(what a baby, huh?). I'm thinking light sensor...? HL switch, maybe?
Thanks for any suggestions

Mine do the same, they will often come on when the vehicle is moved or jarred a bit, such as when I shift gears or go over a bump. I can also sometimes manipulate the switch to make the lights come on and stay on, which leads me to believe it may be a problem with the switch itself or something closely related.