my instrument panel lights keep blowing a fuse as well. It is the "illumination" fuse. Second from the botom towards the front of the truck in the in-cab fuse box. This fuse is not hot until you turn on the park or headlamps. The headlight switch is toast on mine and I am replacing it tonight but if the fuse is dead until you turn on the lights, then it has power, how could the switch be blowing the fuse? This truck is a mutt anyway so it is hard to tell what someone has done to cause this. I have spent the evenings of last week sorting through a lot of "engineering" blunders.

 

The big update, tail light/park light and gauge light problem fixed. Are u ready? It was the 15 amp park lamp fuse not making a good connection. Tweaked the spades with needle nose...rammed her in there and walla! Did the same thing with loose horn relay in PDC, tweaked the spades a little, reinsert and got horn. But the most important thing was making sure there was fuel in thar tank.

 

Make sure your spades are making good contact. I remember my park lamp was arcing a couple years ago when i wiggled it. If current has to jump to far could be causing fuses to blow. Headlight switch isn't a common problem.