Here's a funny thing: I've finished putting the GT back together today and went to start it. Everything lit up but no starter motor. kick started fine. Tried electric start again. Still nothing. For whatever reason, I pulled the clutch lever in. I don't know why, the only bike I've ever owned with the clutch /starter lockout is my DRZ. Anyway it fired right up. Fooled around with the headlights switch and found it'll start with clutch out/headlight off but needs clutch in/headlight on. Dicked around for a bit longer and now it's back to usual, starts any old how, no clutch input required.
I've never bothered looking at the wiring that goes into the clutch switch til now but sure enough, unplug it and the bike won't crank. I guess the switch must have been faulty since new?