Basic auto switchover unit will work swell. Inland RV or Out of Doors Mart will cheerfully sell you one. Call them, tell them what you have, they'll sell you what you need.
Any RV place and believe it or not, Walmart, Lowes, Home Depot or any boat supply.
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MICHAEL
Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."
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