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It would be very odd for all lights at the trailer connector to be dead, since they all are on different fuses and relays. Can you turn the key on, set the parking brake, shift to reverse, turn on the headlights, and the hazard lights. Are all pins at the trailer connector dead, if so are you testing with the connector ground or another ground?
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The trailer lights work when I hook it up to a different truck FYI. Let me go put my meter on it. Ground to chassis or plug ground?
I would like to know if all power pins to the lights, battery charge and brake electric brake are bad as well is the trailer connector ground pin is faulty.