I have a 2007 Itasca sunova 35J house batteries charge when on shore power as well as when the generator runs, but not when driving. I've looked through the web and found that it's possibly the sol...
Both the house power solenoid and the boost/charge solenoid are located next to each other. Use either the boost switch or the house battery switch to make the solenoids click off and on and follow the noise to locate them. They might be near the steps and the batteries on your Winne.