Trailer light issue

[richardapu]

Hello all. Seeing if you could point me in the right direction.

Rear left trailer lights do not work (break and turn signal). Both connections have the same issue (the round one and the 4 prong flat one). I have tested different trailers and different adapters... I have checked the all of the fuses in the main box... What is next?

 

[Tulecreeper]

Hello all. Seeing if you could point me in the right direction.

Rear left trailer lights do not work (break and turn signal). Both connections have the same issue (the round one and the 4 prong flat one). I have tested different trailers and different adapters... I have checked the all of the fuses in the main box... What is next?

Silly question, but have you actually taken a circuit tester and checked that there is power to those pins?