Well, it is probably the output of the inverter circuitry...but internal to the inverter. If the circuits are powered when you are on shore power, that means the output fuses and the GFCI are all functional as is the wiring. All that leaves is the transfer switch, which as I indicated is internal to the inverter. If you measure the voltage on the duplex receptacle on the back and take away shore power and it goes away, it has to be internal to the inverter.
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2015 335DS
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