Bike: 2011 D675R
KMS: 15 000+
Use: everyday, all year round
checked VIN with dealer, no recall notices currently, or repairs in the past
History: I bought the bike 18 months ago, have never charged it since and it has started first time, every time. I stopped to get fuel today, bike wouldn't start. I jump started it, got home and measured the voltage of the battery, 11.5V, charged it for hours until the charger said "full", got a reading of 13.1V.
5 mins later, after packing the charger away, the reading was 12.8V. By the time I installed it in the bike it was 12.4V. I KNOW I have a bad battery, a new one has already been ordered. But I then followed the instructions of the OP to see if the battery was bad as a result of a bad R/R or stator, here are the results in order of the OP's instructions:
Cold resistance check on R/R: no shorts
Stator test: measuring 1-2, 2-3, 3-1 all readings are 0.4 ohms to 0.6 ohms
checking any one stator pin to engine ground terminal (i tried chassis, engine and negative battery terminal, not sure if this is what I was supposed to do) Also go <1ohm readings (OP's post says I shouldn't get any reading)
last test was checking AC output voltage from stator when Bike is running:
1-3: 18V (idle) 40V (5k rpm)
2-3: 19V (idle) 50V (5k rpm)
3-1: 14V (idle) 34V (5k rpm) <-- is this bad?
Battery voltage: 12.4V (bike off),
12.1V (ignition on),
12.0V (bike idling) to 12.4V revving bike
Do I need a new stator, new R/R or both?
Stator is definitely toast