If you have a meter ( or even 12V auto bulb) you can check the +12V pin on the TV connector. If it was not connected you may have drawn the battery too far down to have it charge or blown the fuse in the battery line ( usually near the battery.) Do you have AC (110V) in the outlets when you are plugged in?
I have a 2005 Chevy and my trailer power wire was connected, but the fuse had a blank plug in in. Added a fuse and bingo power.
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