On first trip of the year old house battery (group 27) died 6 hours after setting up. All the 110 appliances worked, but all of the 12-V lights dimmed; battery indicator on the house monitor said it w...
Clearly your charger is not working. The battery shouldn't drain at all when you're plugged in. Measure the voltage at your battery terminals when the camper is plugged into 120v AC. It should be at least 13.4, preferably higher. It may be as simple as the 120v AC breaker that powers your converter is tripped or turned off. Or, your converter may be bad.
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