Our Dometic fridge has a gas button on the top panel, which when "out", indicates that the fridge is operating on gas. When it is depressed or "in" , the fridge is on 110v. If it is on Auto, it will select electricity if both modes are available.
If you have a manual for your fridge, there will be an explanation of its operation.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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