The need for a decent wiring diagram

Folks,
without calling the Bentley book ugly, because it has been great up to
this point, does anyone have a decent set of schematic electrical
drawings (wiring diagrams) for the 1977 Type 2 Bus? The ones in the
book are not clear, and in many cases just not accurate.
While I am not an expert, I am in fact very used to reading wiring
diagrams for other vehicles. Even with my knowledge (limited though
it is), these drawings have done nothing but frustrated me to the
point of literally being forced to follow the wires from beginning to
end point to make sure they did what I thought they did. But my main
concern is with the modules that can be found here and there, and just
what their functions are when diagnosing problems.

Any help would be appriciated.
Chuck