lighting/turn signal issue

By nothing on left side you mean no brake,tail or turn or just no marker lights, marker and tail should be together, so look for a broken wire maybe at a juntion box, or broke near one of the light sockets, need more info though.

 

Could be a bad plug or socket on your pigtail.

 

I thought about don but i think hes saying everything works but the left side markers, theres only one wire for tail and markers so it has to be the wire conecting the right to left, thats why i sked him to clarify his detailsa little more.

 

Why not post this in The Garage? Look in the rear of your trailer for a junction box or the harnesses. The wire or post that powers those turn signals is probably corroded. It would help to know year and make.

 

The lights in the rear of the trailer are probably pop riveted in. What i would do is pull the light that is not working and follow the harness to where it plugs into the main cable your problem will be in that area. You will need a test light to see where you do and don't have power.