I would check the 12V fuses first, then the connectors down in the furnace compartment. Wouldn't hurt to check the house battery voltage either. If your converter isn't working, you can be fooled into thinking the batteries are fine since everything in the house keeps working, for a while. But when you try to run something big, like the furnace, it won't start. Converter not working can usually be traced to a GFI.
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