If that switch is like mine, it's about the most rinky-dink thing on the bike. Mine comes apart with a little playing and I cleaned the brass gizmos inside it and it works, but not to my satisfaction. It's a normally open switch, doesn't matter how you hook it up, there should be 2 terminals coming out of the harness for it near the front. All works in conjunction with the rear switch too. I'm still trying to figure out where I can put a micro-switch that is unobtrusive. That's not much of an answer, but it's not magic.
Dave
69S