Our TT is very different, but looking at my schematic, the bath fan and ceiling light is tied together on our #3 12 volt fuse. Open the door on your converter, and see if there's a red light on next to one of them. It's a feature that makes locating a blown fuse easier.
There should also be a label on the inside of the converter door with which fuse goes to what, and also for the circuit breakers on the 120 volt side of it.
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Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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