Usually when a convert fails, it will be outputting a variable voltage. Occasionally, it will be the correct voltage but then the voltage will drop and you will see your 12 volt lights dim.
Check the voltage at the battery and one of your dash 12v outlets. It should read the same within a tenth of a volt. Typically it will read about 13.5 volts when on shore power.
If the battery voltage is lower by a couple of volts then, look in the battery storage area. On the left hand side as you are facing into the coach is a red button. It may not look red due to the over spray from the terminal corrosion spay. Try pushing the button.
Bruce
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