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Bob,
If you are going to tackle this problem yourself, you should buy a volmeter or borrow one. Connect to shore power and read the voltage accross the battery. If you read about 13.5DC then the converteris charging the battery. Check you battery by the hydrometer battery tester and/or measure accross the battery with Shore power disconnected. Should read 12VDC.
If you don't read 12v w/shore disconnected, your battery is probably bad.
If you don't read 13.5 w/ shore connected then your converter/fusing has a problem.
Also with the voltmeter check your shore power coming into the converter. Should be 115-225VAC.
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A long time ago my converter was not charging(no 13.5). The charging circuit in the converter will have a large resistor toward the back of converter. Sometimes this resistor opens. In my case I found a bad solder joint on one of the connectors to the resistor. Re-soldered and have no problems since except for a blown fuse in the trucks charging circuit.
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