I don't have an F-150, so bear that in mind. But I believe you have found it. It should be under the dash, near the steering column. Check. It should be a connector with no matching connector plugged into it. Check. It should have four wires. Check. The wire colors are traditionally Red (+12 volt supply), Blue (trailer brakes), White (ground), and another smaller wire which is green in your case. The green wire comes from the brake light switch, so you could either follow it physically or put a meter or test light on it, and see if it comes up when you push the brake pedal.
Of course, the ultimate confirmation is that there should be a matching connector with four wires, each about a foot long, with a page of documentation, in a plastic bag in one of the storage compartments of your vehicle. Maybe/maybe not the glove compartment - check under the seats, too. Have you found it?
Bill
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