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My mystery is solved. The wiring harness that contains the yellow wire from the TRM (left trailer turn signal) exits the cab and runs along the left frame rail. Under the driver's seat there is a larger connector. Maybe 25 pins? The pin connected to the yellow wire was pushed out. Previous owner...

F56&F63, F73&F87 don't exist. The TRM is there. When pugged into the computer it shows the TRM working. I'm down to a wire fault somewhere between the connector on the frame rail under the drivers seat and the right kick panel where the TRM is located. Looking forward to pulling the dash to...

F73 and F87 don't exist in my fuse block. Just blank spots. I replaced the harness and installed the seven pin/four pin plug. Previously I just had the factory installed flat four under the bumper. When it was first plugged into a trailer everything worked fine, including the left turn signal...

Did you ever get this issue resolved?

I've the same no trailer left turn signal problem. I've gone through the heart break of dealing with the fuse boxes and finding no fuses. I've pulled three different trailers with the same results. So, has anyone got the answer? Why doesn't my trailer left turn signal work?