EDIT-- Disregard the findings below. I hooked it up to the motorcycle as it would be in the circuit, and it worked as originally drawn. I guess my ignition pulls lower than just an open switch on my trainer.
I wired this up on a trainer, and I couldn't get it to work as drawn. I noticed if I unhooked the trigger that would be going to my motorcycle ignition and then grounded that wire, it would trigger. The problem is my ignition just goes to open, it won't take the trigger to ground. So I wired it up as shown on my trainer, and did get it to work with out any problems. I just don't know if this will produce a significant ground on my electrical system. Can you please advise me. Thanks, adown