Trailer plug

[Nrichman]

I noticed the other day whenever I hooked up to my trailer that I didn’t have right turn/brake on the trailer. I have confirmed that the trailer lights are working with another truck and testing the plug on the trailer. I checked the fuse under the hood (F10) and it wasn’t blown. Changed it just for giggles and still nothing. I have confirmed with a test light that I have power on both side of the fuse and also checked the bottom of the fuse panel and I have power there. However when I tested the plug on the bumper I had power on everything but the right turn/brake. Went under and unplugged it from the bumper and still had no power. Back probed the wire and had no power. At this point I’m thinking I have to start chasing that wire to find where it loses power. However wanted to know if there was a chance I was overlooking something simple. Any ideas?