I found the exact problem I am having on a google search but the original poster never came back to post what fixed it. I have an 81 c10 Scottsdale. No instrument cluster lights. I installed a new headlight switch because it was cheap and a good guess. Didn't work. What happens is when I pull the light switch to running lights or headlights. My turn signals lights on the dash come on and stay on, the fuel hand drops to empty and still no instrument lights. I have checked for loose grounds around the truck. None so far. Im going to pull the instrument cluster soon and was wondering what to look for back there. Fuse is good. Also Im gonna pull that old aftermarket stereo and see what kind of mess they made behind there. Any info would be greatly appreciated. This is my first squarebody so Im new these trucks. Thanks!