I believe you are correct in leaving the store/use switch in the use position. In store, I don't think it charges either the house or chassis battery or maybe both. I keep my coach plugged in all winter and have had no issues with batteries being dead or drained. I assume its the same on a Vegas but someone with a Vegas may know for sure.
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Tom and Lisa
Pennsylvania
2015 Challenger 37TB
2015 Ford Taurus toad
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