Thanks for the info, Cody.
Here's my deal though - all interior lighting is driven from the instrument cluster. Thus, when I pull the cluster and unplug it, fuse #35 does not pop. As soon as I plug the cluster back in, "POP". Thus, I know all wiring is good from the block, through the firewall plug and up to the cluster.
I've sent the cluster off and had it completely gone through, and it is fine, thus my short is somewhere else within the cab. Just waiting for some warmer weather to actually spend the time outside to try and track it down...