At last! After about a three week exercise, I now have a fully charging G3. The complete charging system was shot. So with a professionally re-built dynamo and one of Sean Hawkers solid state regulators hidden inside my MCR1 box....all is well. I think this is the first time the battery has had a jolt since I've owned the bike.
If it stops charging now for any reason. I'll simply do what others do and make sure the battery is fully charged and try not to ride at night 
While I was at it, and to stop the cow pats of semi fluid grease appearing under the bike. I removed the gearbox and fitted a sealed bearing at the sprocket end of the main shaft. It seems that for this application, Matchless used a standard bearing that was then modified by having the inside diameter ground to fit a larger shaft. My local bearing firm was able to do this for me.
Has anyone ever bought these off the shelf anywhere?
I didn't even try the usual Matchless suppliers as I doubt very much that they would keep a sealed bearing in stock. So a £15 bearing cost me £50. Ron
email (option): ronpier@talk21.com
At noon on Christmas Day, lets everyone raise their hands in the air.
As Confucius say: "Many hands make light work."
email (option): britool51@hotmail.com
I think they were all on drugs at Plumstead..Put the dynamo where it can't be accessed, use a non standard bearing in the box for no particular reason, fit the wheel bearings in backwards, throw in a handful of fiddly loose spacers and then make 5 versions of everything..Good job they weren't trying to be awkward ...Ian
email (option): ian@wright52.plus.com