* Under the dash: This is the most likely location. You'll need to look for the wires near the brake pedal assembly or the area where the wiring loom enters the firewall from the engine compartment. You'll likely find them bundled with other wires, so careful identification is key.
* Behind the kick panel: The kick panel on the driver's side often hides access to some of the wiring related to the brake lights.
* Near the trailer wiring connector (if equipped): If the Explorer came with a factory trailer wiring harness, the brake controller wiring might be located nearby, although it's not guaranteed.
Important Note: You absolutely must have a wiring diagram specific to your 2003 Ford Explorer. Improperly connecting the brake controller can lead to electrical problems, malfunctions, or even safety hazards. A Haynes or Chilton repair manual for your year and model will be essential. You can also find wiring diagrams online through forums dedicated to Ford Explorers, but always verify the source's reliability.
What to look for: You'll need to identify the following wires:
* Brake light wire: This will supply power when the brake pedal is depressed. It's usually a 12V wire.
* 12V power wire: A constant 12V source, often found on a fuse box.
* Ground wire: A solid ground connection to the vehicle's chassis.
Before you start:
* Disconnect the negative battery terminal: This is a crucial safety precaution to prevent electrical shocks and short circuits.
* Use a test light or multimeter: Don't rely on guesswork. Verify the function of each wire before connecting it to the brake controller.
* Consider professional installation: If you're not comfortable working with automotive wiring, consider having a professional install the brake controller.
Remember, safety is paramount when working with automotive electrical systems. If you're unsure about any step, consult a professional.
