So can anybody here tell me how to locate the plug for plugging in the brake controller other than "It's under the dash"? I've looked and can't find it. I see several plugs but all seem to be attached to something and none appear to be the same plug as my brake controller adapter harness.

 

The plug is behind the receptacle that the OEM controller goes to, if you have it.

 

Once again it seems YouTube is a better reference source than the F150 forum. I was able to find an informative video showing me how to access the wiring plug. By reading the comments I discovered I didn't need to mess with the center stack and was able to access the plug just by removing the panel below the steering column.