Check the 40 amp fuse, should be in a red weather proof holder just behind the battery box.
There's also a 20 amp polarity reversal protection fuse on the fuse panel inside the camper on the converter. I believe it's the bottom fuse. Check that one as well. If you have your battery cables hooked up backwards it will kill that fuse to prevent damage to the converter.
My guess is your battery is OK. Let us know what you find out.
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