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Hi
Have you checked the 12V house power at the rear bumper or the bed receptacle if not using a bumper receptacle?
As for the converter / battery charger with the TV (towing vehicle) disconnected and the trailer on ac power you should have a charge rate of about 13.5 to 13.9 volts. A very dead battery will hold this down to around 12V but after several hours it should come up. One of your local auto repair company should have a DC clamp meter that will read the amperage coming in or going out of the battery.
If you’re not getting a charger from the converter there is a pair of fuses in that unit that may have failed if the converter over charge a dead battery.
If you put the make and model of the trailer and your TV in your signature it would be helpful for those of us that nay have a similar trailer to tell you just where to look for fuses and circuit breakers.
Phil P
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