[Phil P]

Note to the OP

Let’s do one problem at a time.

Let’s start with pin 4.

I don’t have experience with the late model Ford trucks the latest I have is a 1999.

Most trucks have 12V on pin 4 all the time. But yours may be setup to only supply 12V when the ignition is on.

If you are not getting 12V on pin 4 at any time then check to make sure the system has been enabled. Our 2009 Silverado came from the manufacturer with the trailer package installed but the wire to pin 4 was not connected at the power center. After connecting this wire we had 12V on pin 4.

Also there will be a fuse in one of you fuse panels check that to make sure it is not open circuit.

Now for the brakes tell us what you are working on disk or drum?

Phil P