Originally Posted by mncattail
do the battery cutoffs disconnect the batteries from the charger?
Maybe. I had one that did and one that did not. It also depends on whether you are talking the built in setup or an after market disconnect that usually kills everything.
The best thing to do is to adjust the batteries to where you can get to them. Turn the battery disconnect off. Start the unit and see if the voltage on the house batteries goes up. Repeat with the engine off and plugging in the shore power cord. Finish by checking the chassis battery with and without the shore power plugged in. Any increase in voltage is an indicator it is probably charging.
FWIW I have not seen a smaller unit that charged the chassis battery when plugged in. I see problems with the higher end units failing to charge so assume they normally do. It seems to be one of the many things one needs to find out for one's self.
That reminds me that I need to set up a charger to feed the cigarette lighter plug on the new unit. I plan on plugging it into the coach AC so that when I plug the winter cord in it tops off both battery sets. I do not trust either charger to properly float charge either battery set so I just run a cord out to the MH and plug it in overnight once a month or so. A quick look with a DMM checks the condition when the weather is OK and I get curious. ;-)