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Well if you are charging the chassis battery via the alternator OK (engine running) and you operate the emergency start switch you are connecting the chassis and house batteries together "manually" via the interconnect relay and you should now see the 14+ volts on the house batteries if things like basic wiring etc are working. (As I said in my previous post there may be an issue with the BCC sense circuit for operating the interconnect relay automatically). You also might be able to hear the interconnect relay operate when you operate the emergency start switch....this would confirm physical operation at least. Electrically it should be OK since you said the converter can charge both chassis and coach batteries when on shore power (the BCC operates the interconnect relay automatically in that situation).
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