No. The TV voltage will come in on the big black and red cables.
With the TV connected (and running), and the cables off of the battery, what voltage do they show? If nothing, then you're not getting any voltage from the tow vehicle.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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