Interesting but unexpected find. First for the known stuff but it was good to confirm and see it in action:
Coach battery with nothing running: 12.2V
Coach battery with MBS engine running: over 14V
I believe the battery switch was on, but neglected to make a note of it.
Now for the new find (at least to me) (and this was in a different day from the above readings):
Chassis battery with nothing running: 12.16V - could use some juice.
Chassis battery with generator running, key "on" (position 2),
Scrolling through the onboard computer: watched it rise from 12.9 to 13.2 to 14+.
Turn the key off, wait a minute and check again, voltage is down again. Turning the key to position 2, you can immediately hear the generator take on additional load, and the battery meter goes up again.
So - not only does the engine alternator charge the house batteries, the generator charges the chassis battery - but only if the key is "on." This is great to know for boondocking or if we ever find ourselves with a run down chassis battery that needs a boost.
By the way, I just ordered one of these and it should arrive today or Monday:
Zeltauto LCD Cigarette Lighter Digital Car Voltmeter 12V/24V Vehicle Voltage Gauge Monitor for Auto Car Truck (1piece) https://www.amazon.com/dp/B00VL9JZ0K..._uCoRwbEA1PNA3
This will allow immediate battery checks for the chassis via the cigarette lighter socket in the cab (which I believe is "always on" with or without the key), and the house batteries via the socket in the living room with the battery switch on, or even the outdoor 12V socket - without using a multimeter or opening the battery compartment or the hood. It can also be used as a steady state meter, although I won't leave it on when not in use as it would be a slight drain.
Land of 10,000 Lakes
2016 Forester MBS 2401R