I have a 1990 dodge 3/4 ton 4x4. none of the dash lights work not even the heating display. I pull the headlight switch out and the fuse has power i turn it and my test light goes dim and turn the switch back and my test light gets bright. i was wondering where the juice goes after the fuse or any tips on what the problem might be. thankyou matt

 

I know this is obvious but have you checked the bulbs that could possibly be the problem? I had the same problem in my 89' I fixed it by running a jumper wire to the headlight harness. It's kinda a jerry rig but it fixed the problem.