"but are inconsistent as to whether they use a dot or a simple cross to indicate a connection where wires cross. "
aren't infallible. No one wants to pay an engineer
to proofread them, and if they aren't using an electronics
CAD program, it would be all too easy to forget to draw the "dot" on top of a connection. Using lines that simply cross, instead of having the semi-circle to clarify there is no connection, is of course again faster and cheaper. (sigh)
You might be able to extract some information directly from Hitachi-US but if I'm remembering right, they don't like to talk to end users. A lot of boat systems omit the sensing wire or tie it back to the output, since "just one" sensing wire will always be hooked up to the wrong place in a multiple battery bank system.
One of the little books
(the 12 volt bible?) has diagrams for an awful lot of alternators, aimed at showing you how to bypass the internal alternator and use externals. Apparently there are many ways to skin a cat and almost as many ways to design integrated alternators and regulators. If you can find out for sure what alternator you have, you might find the diagram in an auto shop manual at a library. Try some generic Japanese car manuals
, they are usually Hitachi or Denso.