Good news on your 12v issue--despite our best intentions, sometimes we get a bit carried away on IRV2 and try to explain how to "build a watch" when all the OP wanted to know was "what time is it?"--oh bother. Realize the rig is new to you but as soon as you can, you need to locate both the chassis and house battery banks and verify that water in the cells [if appropriate] are at proper levels--a "specific gravity" test of each cell is also a good thing to do.
2003 40' MDTS
Garden Ridge, Texas