Well, I dunno! No reason, other than I'm surprised that everything on the bike but the starter circuit would be running off that one small wire - all the power draw, and the charging. Don't the electrons bump into each other as they cross?As I look at the diagram, yet again, I see now that indeed there is only one wire feeding the whole system, and that's gotta be it. It shows all the fuses "before" the ignition switch, but they're there.Seems like this must be the answer - took awhile, huh? I know it's a lot of dope slaps, but think of the exercise you guys have been getting!