No work today, so I'll do some research...Mine is Standardish system though- 6V (- ve earth) & mechanical reg, so obviously a different animal.
To sum up what it's doing is; lights on- full discharge. Engine running, ammeter shows various charge- up to full (~8A) Lights on; cuts it back to ~just above 'neutral'...I think, because it varies a bit.
Battery is ok, shows about ~7.? running and ~6.2 at rest, even when laid up for 7 weeks (analogue V meter 'semi-permanently' mounted).
I suspect my cut-out needs adjusting, as if I recall I mixed up the value last time (a few months ago)...and I rewired the dipper switch the other day and haven't popped a fuse for a while...
may or not be of help to you though