Have you opened up the battery compartment yet? I would suspect the inline fuse is blown or missing. You always want to have the battery connected while underway. The battery will power the emergency brakes if you become disconnected.
Also some TTs have power disconnects for the battery, might want to look for a red handle to disconnect the power.
Also note there are lots of phantom power drains on the battery, so if you are not connected to an external power source, you should disconnect the battery to save it. It will be dead in 1 -2 weeks from the phantom power drains.
Also go to your local auto parts store and buy a couple packs of spare fuses. There should be a 30 amp fuse in the battery box, and a number of 15 amp fuses in the fuse box. If you blow one, you will blow a bunch figuring out why you blow the fuse. Tongue jacks seam to blow a lot of fuses at times.
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