The trailer lights aren't working.
The trailer socket at the back of the vehicle is the main connection for this system and should be checked for dirt and corrosion. Also, the system is on a fused circuit where fuses can pop to prevent circuit overload. I would suggest having a reputable mobile mechanic come to your home or business to check the fuses, wiring and bulbs front to back for failures with a thorough inspection of this electrical system.
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