1995 Chevy Truck loss of dash lights, parking lights, taillig

You have a short circuit with the running lights circuit-could be the multifunction switch-No electrical background bring it in. NOTE: Do not use a higher amperage fuse to get it going-could catch on fire.

It doesn't blow till you turn on the headlites/park lites? You may have to get at the connector for the headlights. Brown wire carries voltage for the lites your missing, probably a short to ground. Probably the tail lite circuit, but, there is a junction on the brown wire where several circuits come together. You need to be sure which circuit branch the short is on, rather than find the short, you splice in a new wire on that branch.