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Hi, your description is interesting. Lets do this lets begin in the beginning. With the caravan unplugged do you have 12volts to the control board? Take a look to your right at the burner assy, and heat stack, do you see wires running to a small component rivited to the stack? Lets discuss this thanks
Hi the unit needs the 12volt supply to operate in all modes, only needs 120 when on ac operation. the only connection between the two is that when you are plugged in the converter is charging the battery, and supplying 12 volts to the system. With your voltmeter, check the voltage (dc) at the connection to the coach wiring, with the shore line plugged in, and without it plugged in. thanks. Please give me the voltage readings......