Yes, the converter could be gone. Or the batteries (have you checked the water level?). Or a wire connection. Or the power into the converter.
Trouble shoot to narrow down the problem. Like for instance, put a meter on the input of the converter to ensure 120v in. Compare the voltage out from the converter and the voltage across the batteries; they should be the same, and between 12v and 13.4v depending on the type of charging it is doing.
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John (40' 2004 Country Coach Inspire DP)
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