I recall there's a red button on the converter that must be in the "on" position. Take out or disconnect the battery and put it on a good charger overnight, then see if the converter will run the fridge. Also, I've discovered one battery is not enough to run the fridge very long. I suggest you add another.
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2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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