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I didn't get any response in the van forum so I am trying here...
1978 E-250, 460, Auto, AC, I assume truck will be very similar.
I have electrical diagrams but none of them show the pin connections to the actual switch connector. I took a picture before I pulled the wires but I didn't check the exposure. My Canon digital Rebel no longer sets the aperture in the auto modes.
Anyway, if someone can list wire colors and pin designations or provide a diagram, I will be back on the road.
My guesses aren't panning out.
I am not really sure what is relevant,
front A/C only
automatic
dual batteries
dual tanks
no rear heat
no power windors or door locks, although I am installing some I pulled
no clearance lights (going from a 1978 f series diagram)