Jpaw....you are correct in that there should be three wires on the back of that disconnect, according to the schematic. One is the incoming 12vdc from the battery/breaker, ans continues on to the buss bar for your unswitched 12vdc and converter. The switched terminal gets hooked to your 12vdc fuse panel, (also built into your converter). It's designed this way so that the converter supplies 12vdc, (actually 13.8) to charge the battery when connected to shore power, even if you have the "house" 12vdc circuits turned off.
Now, why your 12vdc circuits are operational, when there isn't a switched leg off the disconnect is a wrench in the works.
The only thing I can figure, (without actually looking at this), is that either at the factory, or at the dealership, someone discovered the 12vdc fuse panel was dead, and wired it the quickest way they could, bypassing the disconnect as a result.. You would have to start looking closely at the converter to determine what's up.
It's complete speculation on my part, but the easiest way would be to jumper from that unswitched B+ going to the converter, to the terminal feeding the 12vdc fuse panel, at the converter).
Oh....and you do have a power converter. If you didn't none of your house lighting would work. The converter turns 120VAC into 12vdc for the camper.
Roger
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