Have Ford Questions? Ask a Mechanic for Answers ASAP
Hello and welcome!My name isCustomerand I can assist you with your question.
Have you checked the fuses?
Are you looking for possible causes?
What size engine do you have? 4.6 or a 5.4?
Ok, no problem. Let me pull up your vehicle.
The brake lights and brake light switch are powered up by fuse F1.2 in the central junction box. It is a 20 amp fuse.
This fuse feeds the brake light switch on the light green/red wire. With the brake pedal depressed, the contacts inside the brake light switch close and allow power through to the brake lights on the light green wire.
So there are a few tests you can do.
1. Start by checking for power going into the brake light switch on the light green/red wire.
2. jumper the light green/red wire to the light green wire at the switch (With the connector disconnected) and the brake lights should illuminate.
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You would simply connect the two circuits at the brake light switch connector.
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