If it is a 12 volt lighting system, and only one light is not working, it sounds like a wiring issue after the switch. I would guess, as someone else mentioned that you have a short in the wire, broken wire, or bad connection between the switch (I assume only one switch working all lights so it is most likely good) and the light. Is there a “gang” plug in the harness (similar to a boat trailer connector), a bus bar, or some other type of splitter after the switch? If so check, the continuity of the light wire between that splitter and the light using a meter.
Additionally, if the bulb worked in another socket it may be a bad socket. That’s why you should put a meter on the socket.
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