Ford F 250 Trailer Wiring Problems

Ford F 250 Trailer Wiring Problems. The trailer running lights quit working. I do have tail lights and a good ground.

Ford f250 wiring diagram trailer lights (Marian Gutierrez)

There are several relays in the fuse box. Brake and back up lights work. The trailer running lights quit working.

There are several relays in the fuse box.

Doesn't the trailer wiring splice into the truck wiring?

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About the time I was done untaping my harnesses under the truck, I figured I would look through my owners manual one. Okay so i have a wiring problem i think. Having a trailer conneted has no effect on the display.