I did it!
Outside the City Hall, in Belfast, N Ireland having ridden 24,000 kms from Belfast, South Africa.

Wow! What a ride, a real adventure!
-You solved the charging/ battery issue?
My K6 charging LED started to flash overcharging last year. Adjusted regulator screw, still flashing.
I had planned to take the first ride of the year last week on that bike, battery too weak for starter despite charging. Installed new battery a few days later
The ride today, voltage too low now ~13.5V max. I have a LED voltage meter too.
When back home adjusted the regulator back to how it has been since 2014 when I serviced it. Hopefully hitting 14.4V max next ride. GEL battery.
The sudden overvoltage must have been the battery that started to throw in the towel.
All adjustment/measurement on regulator must have a good and fully charged battery. Before only text in an instruction for me to follow, last year practical experiences.