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<- Scroll down on that page to download the owners manual for your motorhome. Choose the year, then choose All Dodge models. It will give you a 1999 year manual, this is the correct file.
As the manual states
The auxiliary battery is automatically charged through the isolator by the engine's alternator while the engine is running.
The generator will also charge the battery and when plugged into shore power it will also charge.
Download your manual and check it out, a lot of useful info in there. Any other questions feel free to ask!