no dash lights at all

^^Read Redfish's reply^^ Here is how this all works. The headlight switch receives TWO separate power sources. The power ONLY for the headlights comes to the switch from the welded splice in the black ammeter wire. This is UNFUSED and supplies ONLY headlights, "B1"

"B2" comes from the tail light/ fuse circuit and powers tail, park and dash lamps. So the park/ tail circuit must be operational first

When the switch is on, that power goes through the dash dimmer and out on tan TO the fuse box. and to the INST fuse at one end of the fuse box. THIS IS THE only fuse that is wired in this manner. So in order for power to appear at that fuse, the tail circuit must work, the switch must be on, and the dash dimmer "twisted to the left" By the way try twisting the &*%$ out of it to see if it will "clean" up.