Light wiring question

[Outlaw43]

Hello, love my 2019 Bighorn 1500 I bought used.
There is a wiring kit that I found in the dash that I assume is for hooking up trailer lights because when I first purchased it I attempted to put a light bar I had on my old F-150 on it and long story short it just wouldn’t work. Camera wiring made it impossible to install.
I have the plugins beside the license plate, but the wiring harness for the light bar would not work from it. Anyone know if this is normal or should I have power at the plug from the factory? If lighting isn’t the reason for the harness in the dash what is it for? Any ideas?
THANKS

 

[Ratchet]

Used truck = likely blown fuse for trailer +12VDC . There's also a decent failure rate for the bumper mounted trailer receptacle. I've been a victim of both.

Got a pic of the harness?

 

[Richard320]

Is it a T harness, with a male and female pair plus a lengthy lead coming off it? If so, it plugs into the rear of the trailer socket.