Morning spent discovering that my mysterious morass of most current issues are charging-related. Looks like my fancy, expensive (though obtained at a discount from Hitchcock's used pile) Boyer Powerbox has bitten the dust. I was apparently charging, but very very little. After a few recent rides home after dark, the battery was way behind. Swapped in a new, stock Enfield ("Swiss" brand) R/R via test leads and everything seemed fine, so I pulled the Powerbox and installed that. Lucky I had it sitting around.
It's possible I just cooked the Powerbox by placing it internal to the seat hump. Thought it'd get enough airflow, but to be on the safe side, the new R/R is under the entire seat assembly. It may get occasionally muddy but probably will cool much better regardless.
I'll find a $15 capacitor and wire that in separately. Not gonna blow cash on a new box.
Oh, and I need to investigate some traces of oil, apparently motor oil, I found in the (dry) primary case. There was enough to leave a few drips on the ground when I pulled the cover last night looking at the alternator when I was first investigating the electrical problems. Guessing it migrated up the crankshaft...wonder if that's indicative of anything serious, or just another fact of life with these. Wouldn't be apparent at all if you were running a wet primary.