Before spending any $s, consider consider getting a meter and checking to coach batteries. Rusty's post is correct. The refer needs 11.9 VDC minimum to operate correctly. Choosing electric or gas is just telling the refer how to heat the cooling gas. The rest of the appliance runs off of 12 VDC.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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