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Check the brake lights, are they working? bet not. If not check the brake light switch at the brake arm to the brake pedal, use a 12 volt probing test light ($5 at part store), see is you have power to the brake light switch and when the brake pedal is pressed you have both power in and power out (test light will light up). This problem is common and can be caused by a defective brake light switch connector (available new from Ford parts) or the brake light switch is defective. If the brake light switch is defective go to youtube and search for a video of replacing it, it is a 20 minute job for even a novice.
check fuses. if all good there i would use a test light to check power to brake light switch on pedal. should be two wires. one will be hot all the time and the other will be hot when brakes are applied. if you have power there and no lights still i would suspect multifunction switch is bad on steering column.
At the brake pedal their is switch which is possible loose or out of adjustment or closd circuit,it has two wires you could disconnect 1 wire. Caution!!!' do not use your cruise control until you have it fixed. Allan
I had a similar problem when I owned a 1997 Expedition. In my case, the brake light switch, mounted to the brake pedal arm, was faulty. My guess is that you have a similar problem. Pretty easy to replace... couple of wires and a clip as I recall.
If brake lights not working then its quite possible that the problem is .either the brake light fuse or the brake light switch.The brake light switch is causing the turn signal light to stop functioning.Check out both the brake light fuse and the brake light switch.
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If you are reseting a factory alarm...lock and unlock the drivers door with the key.
If you don't know the code look under the dash driver side in left corner there should be a black cover with a sticker with a code on it 6 numbers that is the factory code.
Did you guys ever solve the issue with your trailer wiring? I have a 2000 Expedition with only one brake light on three different trailers no other lights work. They were working fine and the work fine on other vehicles. I know it could be anything but I'm not sure if it's a known issue that the plug by the rear wheel back to the adapter gets bad or if there is a typical issue that lies elsewhere. I'm just trying to find where to start????