1. The Bulb:
* Easiest Check First: This is the most common cause. Remove the bulb (usually accessed from the inside of the taillight assembly) and inspect it. Look for a broken filament or a burned-out contact. Replace it with a bulb of the correct wattage.
2. The Socket:
* Inspect for Corrosion: Even if the bulb is good, corrosion in the bulb socket can prevent proper contact. Clean the socket contacts with a wire brush or contact cleaner.
3. The Fuse:
* Check the Brake Light Fuse: Consult your owner's manual to locate the fuse box and identify the fuse for the brake lights (usually labeled "brake," "stop," or similar). Check if the fuse is blown (look for a broken filament inside the fuse). Replace it with a fuse of the same rating.
4. Wiring:
* Broken or Damaged Wires: Wires can become frayed, broken, or corroded. This is more likely if the taillight assembly has been bumped or damaged. Check the wiring harness leading to the taillight for any visible damage. This is more challenging and may require some electrical knowledge or a mechanic's assistance.
* Loose Connections: Check all wire connections at the taillight assembly and the fuse box for looseness.
5. Brake Light Switch:
* Faulty Switch: The brake light switch is located on the brake pedal and activates the brake lights when you press the pedal. A malfunctioning switch can cause one or more brake lights to fail. Testing this involves either using a multimeter to check continuity when the brake is pressed or replacing the switch as a troubleshooting step (it's relatively inexpensive).
6. The Tail Light Assembly:
* Internal Short or Damage: Sometimes, internal damage or a short within the taillight assembly itself can cause a light to fail. If you've checked everything else, this is a possibility. You might need to replace the entire taillight assembly.
7. Grounding Issues:
* Poor Ground: A poor ground connection can prevent the light from working. Check the ground wire connected to the taillight assembly. It should be securely attached to a clean metal surface.
Troubleshooting Steps:
1. Start with the simplest: Check the bulb first.
2. Check the fuse: This is a quick and easy check.
3. Inspect the wiring and connections: Look for any visible damage or loose connections.
4. Test the brake light switch (if necessary): This requires a bit more technical knowledge or a mechanic.
5. Consider a professional: If you're uncomfortable working with car electrical systems, take your Intrepid to a qualified mechanic for diagnosis and repair.
Remember safety first! Always disconnect the negative battery terminal before working on any electrical components in your vehicle.
