I am happy to report my add-on grounding junction block is clean, refitted, and treated with Caig DeOxit.
Not surprisingly, the light still flickers at idle after riding. Showing ~14.2at idle, the light goes out at 14.35v (about 3,000 rpm). So the charging certainly looks adequate. Looking likely that the case is: fully charged battery exceeding the charging output. (The "don't worry about it" case.).
Yet, Guzzi2Go, the "special" regulator failure case: can that be tested?