1. Gather Information & Resources:
* Wiring Diagram: This is ABSOLUTELY ESSENTIAL. You can find factory service manuals online (eBay, Hemmings, etc.) or through dedicated Mopar parts suppliers. These diagrams are color-coded and show the exact path of every wire. Do not attempt this without one.
* Your Car's Specific Options: Note everything your Challenger has – A/C, power windows, radio, aftermarket gauges, etc. This affects wiring significantly.
* Test Light or Multimeter: Essential for tracing circuits and verifying connections.
* Wire Connectors & Crimpers: Proper connectors prevent corrosion and ensure solid connections.
* Patience and Organization: This is a detailed and time-consuming project. Take your time and keep everything organized.
2. Preparation:
* Disconnect the Battery: This is crucial to prevent electrical shock and damage.
* Remove the Dash: This involves removing various trim pieces, screws, and possibly the steering column. Consult a repair manual for the correct procedure. Take photos along the way to help with reassembly.
* Clean the Dash and Wiring: Dust, dirt, and corrosion can cause problems. Clean everything thoroughly.
3. Understanding the Wiring Harness:
The main wiring harness runs through the firewall and connects to various components in the dash. Your wiring diagram will show:
* Power Sources: Battery positive (+), switched ignition (+), and ground (-).
* Circuit Breakers and Fuses: These protect individual circuits.
* Gauge Wiring: Each gauge (speedometer, fuel gauge, temperature gauge, etc.) will have its own wiring.
* Light Wiring: Instrument panel lights, warning lights, and other illumination.
* Accessory Wiring: Wiring for the radio, heater controls, A/C controls, etc.
4. Wiring the Dash:
* Follow the Wiring Diagram: This is the only way to ensure correct connections. Start with the main power and ground connections.
* Connect One Wire at a Time: Double-check each connection before moving on.
* Use Correct Connectors: Use the correct size and type of connectors and crimp them securely.
* Test as You Go: Use your test light or multimeter to verify that each circuit is working correctly.
* Grounding: Ensure all components are properly grounded to prevent electrical issues. Ground points are often located on the dash itself or the chassis.
5. Reassembly:
* Carefully reinstall all components: Refer to your photos and repair manuals.
* Reconnect the Battery: Check all functions once the battery is reconnected.
Important Warnings:
* Incorrect wiring can cause damage to your car's electrical system or even a fire. If you're uncomfortable with electrical work, consider seeking professional help.
* Always disconnect the battery before working on the electrical system.
* Take thorough notes and photos as you disassemble the dash. This will be invaluable during reassembly.
This is a very general overview. The specifics will vary significantly based on your Challenger's options and the condition of its existing wiring. A factory service manual is your best friend for this project. If you're not experienced with automotive electrical work, it's highly recommended to seek professional help to avoid damage to your vehicle.
