OK, I have a "before I go any further question for ya'll ....
When I got home from work today my switch was here. After dinner I thought I would get started on the grip housing portion. I mounted the switch in the housing and attached one leg of the switch to the yellow/black which has been stated was a good ground. I ran the other leg from the switch out of the housing using the existing loom that all the other factory wires are in (there was plenty of room in there) and I have it exiting the loom down below the fairing near the fork tubes. I stopped there and figured I would start on the display connection portion of it tomorrow evening. So far so good ...... however, thinking I was just checking my work, I connected a simply 12V test light to an old motorcycle battery that keep in my garage just for testing purposes like this. I hooked one end of the test light to the positive of that battery and I connected the other end to the wire that is coming from the switch that will eventually connect to the display circuit board. My thinking is that if I push the button, it should light the test light .... shouldn't it? If so, I have a problem, because it doesnt.