only 1 battery in mine and same issue Your tow vehicel should charge your battery when towing. Have that checked. If battery is fully charged then the invertor or something not working right. I get about 1-2 hrs on battery to run frdige. Dealer told me 2-3 days. Such crap from the dealer. I'm thinking about adding a battery. Do you have any other issues ? ...Ron
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Pennie / Ron
2015 Sanibel 3901
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