This is the interior, right in the center of the firewall, right above the trans hump.
Anyone know what would have gone here? It's a 1970 C10, has factory 4 season AC. I figure it might have been some kind of AC related relay maybe, but it's mounted in a place that's kind of easy to see, not neatly tucked out of the way. But half of the AC system is taken out so I don't know what it could be. The factory service manual shows an AC relay tucked away on the right side behind the dash. So I really have no idea, hoping some bros might know