A few of us got into a discussion about this topic in March. It came up in regard to a need to come up with an alternative for the shift switch in the Johnson Hydroelectric control box.
I think you will find the information useful but please read all of it because we made a few mistakes in our logic along the way. In the end, however, I think we pretty much figured out how the shift system works in the hydroelectric JonnyRudes.
http://forums.iboats.com/showthread....n+shift+switch