New here;
I have a 2011 E350 XLT. I found the wiring behind the coin bin just like TexsDream77 said. I plugged this harness into it.
2Fwww.etrailer.com%2FBrake-Controller%2FDraw-Tite%2F20270.html
It is flat not round
The white ground wire is good.
The red brake wire is good
The black 12v wire is not hot.
I know the blue wire contects to the blue on the controller, but where does it come out in the rear of the van?
How do I make the black wire hot?