If your refrigerator is running on 12 volt your alternator will not be able to keep up with that and all of the other draws. This will result in poor charging. Make sure your fridge is running on propane. Possibly consider testing your alternator. I should be able to keep up. When I have driven a car with a bad alternator it will run off the battery until it is too low on voltage and then the car stops. I hope this helps.
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