I know, and I've been looking all over for a diagram to add a DPDT series/parallel switch for the spark plug wires on my Honda. I figure that baby would really purr then!
You need the workshop manual. You may order it, or just download it if you find it for free. It has all electric diagrams needed. I know I found out how to debug my Subaru's radiator fan system (to conclude that the fans/system were not the problem, but anyways).