Camjon

I've got the factory hitch setup. When I plug in my trailer the menu says that my trailer is disconnected. Is there something I'm missing here?

DTH

Did you install the fuse and relay that came in the glove box ?????

Camjon

Well there is a 20a fuse in #73 in the fuse block. I'm the 2nd owner.

DavidKR

my truck only sees trailers if they have brakes.

Camjon

Ok so I found the bag with the fuse and relay. What's the extra harness for? Why is this stuff already not installed from the factory?

Lethal Weapon

Agreed that the fuse & relay should simply be installed, but they've done that for years like that.
The wiring harness is for a convenient wiring to a brake controller if you so choose to put under your dash. There is the connector that it's suppose to plug into up under there & you simply snap it in... And hook those 4 leads to an aftermarket brake controller.