Here's a general outline of the process. This is not a comprehensive guide, and the exact steps may vary slightly depending on the specific year and trim level of your El Camino. Consult a 1979 Chevy El Camino repair manual for detailed diagrams and specific instructions. These manuals are often available online or at auto parts stores.
1. Preparation:
* Gather Tools: You'll likely need a variety of screwdrivers (Phillips and flathead), possibly some sockets and wrenches, wire strippers/crimpers, electrical tape, and possibly a multimeter to test the wiring.
* Disconnect the Battery: This is crucial to prevent electrical shock and damage.
* Consult a Wiring Diagram: Find a wiring diagram for your El Camino's lighting system. This will show you which wires connect to the dimmer switch and how they're arranged.
2. Accessing the Dimmer Switch:
* Steering Column Removal (Likely Necessary): The dimmer switch is usually located on the steering column. You'll likely need to partially or completely remove the steering column shrouds and possibly the steering wheel itself to access the switch. This involves removing various screws, bolts, and potentially a retaining nut for the steering wheel. Be extremely cautious when working around the steering column and steering wheel to avoid damage or injury. Mark the position of any parts you remove to ensure correct reassembly.
* Removing the Switch: Once you have access to the dimmer switch, carefully disconnect the wiring harness connectors. Take pictures or make notes to ensure you reconnect everything correctly. The switch itself might be secured with screws or a retaining clip.
3. Replacing the Dimmer Switch:
* Install the New Switch: Once the old switch is removed, install the new dimmer switch. Ensure it's securely fastened in place.
* Reconnect the Wiring Harness: Carefully reconnect the wiring harness connectors, matching them to the corresponding terminals on the new switch based on your wiring diagram or notes. Double-check your work to ensure everything is correctly connected.
4. Reassembly:
* Reinstall Components: Carefully reinstall all the components you removed to access the dimmer switch, working in reverse order of disassembly.
* Reconnect the Battery: After everything is reassembled, reconnect the negative battery terminal.
5. Testing:
* Test the Dimmer Switch: Turn on your headlights and test the dimmer switch to ensure it works correctly.
Important Considerations:
* Steering Wheel Removal: Removing the steering wheel can be challenging and may require special tools. If you are not comfortable with this step, it's best to take your vehicle to a qualified mechanic.
* Airbag System: If your El Camino has an airbag system (unlikely in a 1979 model, but possible depending on modifications), take extreme precautions to avoid accidentally deploying it. Consult a repair manual specifically for vehicles with airbags if necessary.
* Wiring: Incorrect wiring can cause damage to your vehicle's electrical system or even a fire. If you are unsure about any aspect of the wiring, seek professional help.
This is a general outline, and the specific procedures may vary. Always consult a repair manual specific to your 1979 Chevy El Camino for accurate and detailed instructions. If you are not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. Improperly installing the dimmer switch can lead to electrical problems and safety hazards.
