Trailer lights

[Wren]

Ok, I am confused and wondering what to try next. My trailer lights are having an issue. My running lights work and so does my right brake light and turn signal. However, the left brake and turn signal do not. I changed out the relay for the trailer lights and also switched the relays between the left and right trailer turn signals under the hood. I don't see anything under the dash for the trailer lights. Am I missing something? I wouldn't think it is a grounding issue or nothing would work. Also, why is my left running light working and not the brake or turn? Its not the trailer either because I have tried another trailer and a 5th wheel with the same results.

 

[big adam]

Try a test light on the truck side plug.

 

[weekendwarriorfsw32]

Bingo

Try a test light on the truck side plug.

 

[Wren]

Think it may be a bad plug?

 

[Wren]

Ok, so now they work and there seems to be an issue with my trailer. My left turn signal works both the left and the right. However, when I text it at the truck side plug only the left has power to it.