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If the trailer lights on a 2016 Ford Transit are not functioning, the first step I suggest is to inspect the wiring harness that the trailer attaches to. If it is loose or damaged, the lights will not work, and you will have to replace the connection. If the wiring and harness are in good condition, next check the fuse. A blown fuse can also cause the trailer lights to malfunction. Lastly, examine the bulbs on the trailer; if they are damaged or burnt out, they will need to be replaced to restore functionality.
The reason why the trailer lights on a 2016 Ford Transit aren't working is probably because of a faulty ground connection.