My 08 XT quit on me yesterday on a short ride around home. It started running rough, dropped a cylinder then died, Yellow and Red dash lights came on . My battery didn't have enough juice to start it so I got a boost and 2 more boosts later got it home.
Battery voltage at home was 10 volts (Yuasa XTZ14-BS age unknown). I removed the battery and slow charged it over night and it came up to 12.2 volts.
Put it in the bike and it started but voltage dropped to 11.6 then slowly lower until it wouldn't start again. Checking the voltage while it was running did not produce higher voltage as you would expect at different rpms as if its not getting a charge. I'm going to check the Regulator and stator next. If I need to replace either part what are recommendations for sources?