The 30A fuse which is still in it's original place in fusebox was blown. It was a bit swollen, and electrically open. The socket is tight and clean, doesn't look like it was getting hot from high resistance.
I temporarily put a 20A fuse in there and it start and ran, and charged at 13.3. When I revved up the engine to higher revs, it popped the 20A fuse. I had the voltmeter on the battery at this time and the charging voltage was pretty steady at 13.3V when it popped the fuse, so I am assuming regulator part of RR is good.
THe battery (lithium battery tender battery) was on battery tender overnight, and was fully charged.
Next tests I will is current draw on fuel pump, headlight etc.