Originally Posted by 88keys
Now that the batteries are out, I will measure the voltage coming to the two house battery cables directly from the convertor. It should measure minimum 13.2volts.
I don't think it's necessarily a valid test to measure voltage without the batteries in the circuit. Many require to "sense" a voltage from the batteries before they send charging current...this helps prevent thermal runaway meltdown....if yours doesn't have this feature, there is the possibility that the voltage will read very high, as there again is not battery in the circuit to provide a "load".