Are all the clearance lights not working? Do the tail lights work ( not stop and turn) but continuous tail light?
If none of these work, it could be a bad connection in your connector ( dirty contact) plug and unplug a few times) Check with a meter. If not power to tail light pin, check vehicle fuse. Some TV have separate fuse for each set of trailer lights.
If some lights work, probably dirty contacts or corroded ground ( light is grounded to aluminum skin.)
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