Confused about Ford trailer brake controller install and testing

[twr]

I have a 2020 Ranger equipped with tow package. I want to install the FORD OEM trailer brake controller. I am able to locate/isolate the 4 wires for the trailer brake controller.

Before I attempt this I've googled plenty of stuff.

It appears from all the videos I've seen that half show the install of the modules, switch and wire splicing and connections, and that's it, done with install. Is this correct?

The other half show additional wiring running along the door threshold, and up above the headliner, a much bigger job. Is that because these Rangers do not have factory installed tow packages?

And is there a way to test the wiring installation without attaching a trailer, an electronic tester maybe?

Thanks in advance!

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[Marpater]

First question, Do you have a tow package? (7 + 4 pin plug mounted in the rear bumper)?
The video's from my research which show the connections to the 3rd brake light wiring are for the OEM trailer brake controller, the one which don't show this are for aftermarket controllers.

Aftermarket controller work the same except when it comes to some of the safety braking features of our trucks.

 

[EJH]

And is there a way to test the wiring installation without attaching a trailer, an electronic tester maybe?

https://www.ranger5g.com/forum/threads/redarc-tow-pro-elite-install.1924/post-348131

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