Sorry, but have to ask. Do you have the "Use/store" switch in the "use" position? If not the batteries are not connected and will not charge. Of course they shouldn't discharge either.
The converters Thor installs do not have a stellar reputation, but as was mentioned it shouldn't have failed already.
Do your lights, etc work if you put the use/store switch in the store position while on shore power? If so the converter is getting 110 and putting out 12 volts. That means that the charger stage isn't working or is not connected properly.
Regards,
Randy
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