This doesn't help with your question but is just FYI. My first two campers (back in the 70s) were 3 way refrigerators. Propane, 12V DC or 120V AC. Don't know why they got away from them. Think people were using 12V long term while hooked to power and that wasn't how it was intended to be used.
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Paul Northport,AL W4XH
2013 358 RLT Mountaineer
2008 Silverado Duramax
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