Originally Posted by Crilly
The 1200 has a 800 or so watt charging system. The 800/650 has a 400 watt charging system. Under low voltage the system sheds power. First it dumps the accessories power. I believe the horn relay is part of the accessories. I am thinking, but not sure.
Crilly, now that is intriguing. I was testing it at idle. 400 v 720 watts is a significant difference. I think I'll test that theory before anything else.
Fortunately the relay I used for the horn has a fuse slot built in to it and I pulled that to disable the circuit. Bonus-- I can reinsert it without dismantling the bike.