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There are typically two kinds of switches used for boats; a 1-both-2 switch and a simple on-off switch.
They do look very similar, and of course, you would want to make sure you buy the on-off switch as typically RVs have their house batteries wired in parallel, where boats typically use a house/starting battery with the 1-both-2 switches.
But I have seen a bunch of different setups. My last boat had two engines, and two batteries and a single 1-both-2 switch. It was a weird setup with a single battery supplying both engines simultaneously. No, I would not have done it that way.
I had always wanted to upgrade that to three batteries (2 starting and one house), but we got rid of the boat before I was able to do an upgrade.
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The only thing that works on a RV is the owner...
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