I installed new socket bulb I installed new junction box under bed of truck checked all fuses everthing ok
Check the wiring to your hitch I had the same problem I had to replace my female part of my wiring to my hitch replaced all that fired it right up no problem
Check that the live wire hasn't corroded,or broken off some where.what you can do is run a live and earth from the passenders side to the other side and connect to the terminals and see if that works.If it dosn,t then the box is faulty.
Check that you have a good solid Ground connection at that light housing and bulb socket.
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