1. You can't check fuses visually -
Get a fuse tester. It can save you days of agony.
2. Your Triumph doesn't work without a functional headlight - or- at least a functional headlight circuit. (I haven't tryed a completely burned out bulb.
3. If you know a great 'wrench', appriciate him/her, and heed their advice -
A two minute question directed to the GREAT Don B. @ Collins Cycle solved what my 4 days of 'hunt and try' investigation could not. ( I had that little baby running 5 minutes after the two minute question/answer session.