2016 Interstate EXT - Magnum MMS Inverter Error Message
I had the exact same problem and troubleshooting results as described by Harmantick in his post.
With a volt meter, I discovered the coach batteries had 12+ volts on the brass battery connectors, but zero or virtually no voltage detected on the battery cable connector right at the battery. I removed the battery cables, thoroughly wire-brushed and cleaned the cable connectors (they didn't even look very dirty or corroded), added electrical conductor lubricant and re-installed. Problem resolved!
This was a lucky find and fix. I'm posting hoping to help someone else with this challenging issue.
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