In the Big Bend area, actually-- never got into the National Park, with its reported 45 mph speed limit. Five of us arrived late Monday-- two rode from DFW, and three of us travelled like Harley riders (SUV and trailer).
Short 85-mile loop on Tuesday. Wednesday, we did a 262-mile ride which included some legendary mountain roads, which broke my first rule of Hwy design-- never put a 90-degree (plus) turn immediately after the crest of a steep climb. Started on 118 South from our base in Ft. Davis through Terlingua, then the notorious 170 to Lajitas (recently remodelled, but nothing happens before 3PM) and continuing on 170 all the way to the end of civilization as we know it-- Presidio. At this point, one rider's thermometer on his ST1300 was registering 108. From Presidio, made tracks North on 67, arriving just before the deer took over the Highway around 8PM.
NOTE: Sometime that afternoon, I noticed that the 'GEN' light was not glowing at start, or any other time.
The next day was my birthday, so I decided to hang out in the Ft. Davis area. Rode to the peak next to Indian Lodge for some photo ops (and got videod from behind, on the descent), then visited the Ft. Davis Historic Site. Leaving the historic site, the R65 wouldn't start. Rolled it a little and got it to start, after which it ran great-- about 3 miles back to the hotel.
Back home, Friday night, I put the battery tender on her and it was showing 'charged' after an overnight trickle charge. Boxers by Bruce was full up when we trailered past his location, but that's where the R65 is going next. My (usually flawed) layman's assessment is that the problem may lie with the infamous diode board, if only because the wiring chart shows that wires from both the GEN light and the starter converge at the board.
Great rides, great fun-- and I suspect that once all the usual suspects are replaced, the R65 will still run longer than I can ride!