Mechainaic, don't have any pictures but the first battery is in the battery box and the second is mounted on the inner fender on the passenger side near the firewall. The ground cable connects to the terminal in the box and the other terminal connects to the battery in the engine compartment. Those are the only connections in the battery box. Everything else then connects to one or the other of the terminal on the battery depending on whether it needs 6v or 12v.

OlBlue, I'm going to look for that book, maybe in the public library? The book is surely out of print but who is the publisher anyway? I'ts really straightforward and I can't imagine that drawing it out is going to be much trouble but I'd love to do a little research before I get started on the electrical plan. The screw in the battery trick is wonderful. Kind of obvious (once it's said). I'm surprised someone doesn't make a "half tap battery" providing even a screw terminal access to 6 volts. Then again, maybe they do.