Picture of 1980 C10 fuse block?

[PRattenbury]

Hey all! This past weekend I replaced my light switch with one I got at the junk yard. Apparently that was a mistake, because Monday morning on the way to work, I lost my Instrument Cluster lights and my tail/running lights. I saw a 5 amp fuse that had some faded lettering that said something about LPS, and I figured I had found the fuse I should check to try and get the lights back. Typically a blown fuse will show power on one side, but not on the other. This particular 5 amp fuse had no power on either side. So I jumped from a BATT slot on the fuse block over to the load side of the 5 amp fuse. I tried the lights, and they worked. At least the running lights did. Not sure about the dash lights, because it was still light outside. But the bummer is, the fuse is getting no power to it. So I need to find out where the power to that fuse comes from. Does anybody know where I should look? My headlights, brake lights, backup lights, and turn signals work. Just my tail/running lights and instrument cluster lights are out. Thanks for any help!