The cluster is completely out of the truck. I am testing at the grey wire terminal on the cluster plug only. I am testing with a lighted probe. I've tried testing with the headlight switch turned to any number of positions. The dome light comes on at the extreme position so there is power in the switch. As I said before, I get power across the panel lights fuse when the headlight switch is on, but I get no juice at the grey wire in the cluster plug. I have a new headlight switch I will try, but I don't know how it could be the switch if the panel lights circuit is energized at the fuse panel when the switch is on.
I followed the test procedures posted by VetteVet in this thread:
http://67-72chevytrucks.com/vboard/s...ash+lights+out