Hi Archie,
It's fairly easy to test the converter. While plugged into 120 volt power, remove the negative battery lead then measure voltage across the positive and negative leads AT the converter. No voltage means no converter power. If you do not disconnect the battery lead you will be measuring the battery so be sure you disconnect it.
Of course there is an EASIER way to get less precises tests and that is to plug into 120 volt power, disconnect the battery and see if 12 volt items will work (water pump, lights, bathroom fan etc).
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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