Originally Posted by k1hog
On a 2004 Roadtrek 200, does the chassis battery charge when plugged in to shore power?
It should, but one of the quirks in the Roadtreks of that era is that the 12v battery switch needs to be on for it to charge the battery.
As a side note, the battery switch should be on all the time when you are plugged in to shore power on these models, IMO, because the charger and battery are on opposite sides of the switch. The charger really needs to have a battery at it's output to run stable 12v in most cases, depending on the charger.
If yours has a charger that checks for a battery before it comes on, no harm will happen, but the the battery will not charge. Some chargers need you to remove the 110v power before connecting the battery which is a good idea anyway, if you forget to turn on the switch.
Bottom line best practice is probably to always turn on the 12v power switch before plugging in or staring the generator, and leave it on until after you unplug the 110v or shut off the generator.
Here is a link to the Roadtrek power simulator so you can see how it all works. You will have to use 2003 Roadtrek 200 as it doesn't list a 2004.