I have been fighting this issue since my bike was a year old. During the last 6 years I have done all the up grades, starter, doubled up on the negative wire, Ken’s keyless system, battery always on a tender, clean tighten connections often, every upgrade made it better but still, every now and then a click and no start! Last year I replaced all the relays on the bike with new triumph OEM replacements! Been just over a year and not one dreaded click episode! Fingers crossed! I also purchased and extra starter relay to keep in my bag, just in case!