Well, that looks like it comes from your clutch safety switch. Now, what year is this wiring harness from? I have a wiring harness from a '73 CB500, which did not have that clutch safety switch (no green-red), and my '75 CB550 that I was rewiring DID have a clutch safety switch. It's actually easy to figure out, perhaps when my wife lets me type a longer explanation, I'll explain the starter solenoid system to you. Wives......turned a 2 week rebuild into a "going on 6 months" rebuild....gotta love 'em.
Doug