I'm working on adding a 7 pin trailer hitch to an existing 4 pin on a 2017 Hyundai Santa Fe.
The last step of the process is connecting to the brake switch wire that is wedged way up on the brake pedal.
On my car that bunch of wires has a sheath tightly wrapped around it along with some electrical tape. I'm a big dude so I'm wondering is there a easier way to get to that particular wire, either inside the engine bay or a fuse tap. As it sits I'm going to have to carefully cut into the sheath and then find the correct wire. I think it is also referred to as the cold brake switch wire.
I also wonder what this wire outputs as the break pedal is pressed. Does it have something as simple as a different values that relate to how far the pedal is pressed like a potentiometer? Or does it just signal that the brakes have been pressed 0v and 12v. If the latter, how does the brake controller know how hard to hit the brakes on the trailer?