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Trailer Lights Not Working Solution: Clean corroded sockets
If the light still doesn't work, you may have corrosion in the socket at the contact points. Attach a bit of 220-grit sandpaper to the butt end of a 3/8-in. dowel with hot glue. Clean the contact points by spinning the dowel and moving it side to side.
In this way, why do my LED trailer lights not work?
The first thing I recommend doing is to check that the ground wire for the lights are securely attached to a clean metal surface on the trailer frame. A loose ground wire will keep the lights from working. Next, you want to make sure the wiring on the trailer is wired correctly and wired by function, not just by color.
Herein, does trailer have to be on ball for lights to work?
In some cases trailer lighting will ground through the hitch ball but that's typically only if the actual ground circuit is insufficient. It needs to ground through the wiring of the trailer harness.
Trailer Wiring Colors Each connects to a different function: Brown wire to the tail or parking lights. Green wire to right turn signal/brake light. Yellow wire to the left turn signal/brake light.