I have a 94 E350, and mine has 2 fuse boxes. One is under the steering column at the driver's seat, by the brake pedal. The other is under the hood, when you're facing the van it's just a little to the left and below the driver's side battery.
I have the 89-96 ford full size van chilton. I emailed scans of the fuse diagrams to
[email protected]. The password is chilton. Go to
asiamail.com, type in chilton for email address and chilton for password and click enter. Lem me know via that email if that was the wrong thing.