Not sure but believe wire color coding remains the same on all like year trucks. Fuse locations might be different but should use same colors. If you get power thru the PNL fuse I would suspect a crappy panel circuit on your dash panel. From the looks of the condition of your fuse box I would re clean all your grounds before you get too involved.
Don't forget what is posted here.
http://67-72chevytrucks.com/vboard/s...d.php?t=185856