Trailer light wiring harness for 3320 CAB?

[SPARKY978]

In the fuse compartment on mine position F-14(R) is labeled "Trailer Power Option", 30 amp fuse. The wire runs to the rear of the outside cab. Never had a use for it, but I thought it was for trailer lights. Might be worth checking on yours and asking dealer what it is for.

Just came across this thread. I can not seem to find this wire on the outside of my 3320 cab. Would anyone know the color of this wire and the exact location where it is located?

Thank you