The switch on top is called an inverter bypass switch. "It is to be turned on if there is no AC power available to the coach when it is plugged into shore power. The engagement switch forces the internal relays into the shore power position." This is from the book for the Source Manager 20. Mine presently is not working on shore power, so have some work to do tomorrow and if not working, need to get replacement. Talked to a gent today and they have not made parts for these in a very long time and new boards are no longer available. Mine has AC in but no AC out. The charger will charge, and when unplugged from shore power, the inverter will work. Presently we are setting in 40 weather on our way south with only inverter AC and a battery charger hooked up to house batteries. Going to experiment tomorrow, and if there are indeed no user serviceable parts in side, I guess it will be history. Hope this may help. Bert
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2006 Monaco Dynasty Diamond IV 42' Tag, ISL 400, Residential Refrig, 10KW Onan, Bosch Washer/220V Dryer (previously 2003 American Tradition 40W)
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