Join Date: Feb 2010
Location: Springfield, MA
The charging voltage should be 14v - 14.5 with engine running.
I also have a 2009 1100 with 30,000 mile on it. When I did the valve shims for the 30K maintenance and removed the oil cooler shrouds, I noticed that the voltage regulator connector sockets were either corroded and/or had gotten hot. probably due to high resistance from the corrosion.
The regulator is attached to the right side oil cooler shroud. Once you detach the shroud, pull it toward you and reach in to separate the connector. You may have to cut a zip tie to unfold the harness.
There are three yellow wires that supply high voltage to the regulator. If you have a loose or dirty connector causing high resistance, you may have reduced voltage to the regulator and, therefore, low output to the battery.
Just something for you to check.
If you find this is the situation and you replace the connector yourself with an aftermarket connector, be careful to make sure to mark the yellow wires before cutting anything to prevent changing their relationship to each other.
If you have a clean connector, then bring it to a dealer or reputable shop that can check the regulator and the alternator for proper function.
Hope this helps.