I had a battery disconnect on my last 5'er which was made by Holiday Rambler. I liked having it so I could disconnect the battery to avoid a voltage drain if I wasn't connected to shore power for a long period of time. Don't know why keystone doesn't install one from the factory on Montana. Used to work in the automotive business and there are a number of good switches available and you may want to consider one that can isolate or connect two batterys if you think you may add another battery in the future.(Cole Hersee used to make a good one and I'm sure RV suppliers can furnish one too)I would wait to get more response before deciding as there may be a good reason that there isn't one on Montana.
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