Get a tester and check your connectors. When facing the female 7 pin connector on your truck with the notch up, the lower right pin should have 12 volts to the trailer brakes when the brake pedal is depressed. The upper right pin provides a constant auxiliary 12 volts that will charge your trailer battery. When facing the plug, notch up, the brake activation pin hole is the lower left side and the constant 12 volts is the upper left hole.
Sometimes you get corrosion around a pin or pin hole and sometimes a wire breaks/corrodes off inside the connectors. I replaced my connectors a few years ago after getting pulled over for no lights. Got out and wiggled the connector and they came on so he let me go.
It could be that the broken terminal wire on the battery just broke the circuit so no current would flow to the brakes from the truck. They should work even with a dead trailer battery. Maybe you could disconnect that wire on your new battery to see if you have the same problem.
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