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If the lights on a 2019 Ram 1500 trailer are not functioning, the first step you should take is checking the bulbs. Bulbs can sometimes burn out and are often the main cause of the problem. The next possible issue that may be causing the trailer lights to not work is loose connections. Ensure that your wiring is securely connected to the harness at the back of the truck. If all connections are secure, the final thing to investigate would be the fuses related to the trailer wiring. If those fuses are damaged or blown, there will be no power running to the trailer.
Some possible causes of the trailer lights not functioning on a 2019 Ram 1500 could be a corroded pin connection, a blown fuse, or faulty wiring.