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Thought I would share this fuse block illustration (courtesy of Ford-Trucks.com, thank you very much), annotated for a 1977 E150 as found in my own.
Note the location numbers do not properly correspond to the fuse numbers called out in the 1975-77 Econoline wiring diagram I have, so this may be a 'work-in-progress' in that regard, but the physical locations are correct as viewed in place.