1. Preparation:
* Disconnect the battery: This is crucial to prevent electrical shock and short circuits. Disconnect the negative (-) terminal first.
* Gather your tools: You'll need a Phillips head screwdriver (likely), possibly a small flathead screwdriver, and possibly a trim removal tool (plastic pry tool to avoid scratching). Have your replacement dimmer switch ready.
* Consult a wiring diagram: A wiring diagram specific to your 1987 Chevy pickup truck's year, model, and trim level is highly recommended. This will help you identify the wires and their functions before disconnecting anything. You can often find these online through repair manuals or forums dedicated to classic Chevy trucks.
2. Accessing the Dimmer Switch:
* Steering column shroud removal: The dimmer switch is usually located on the steering column. You'll need to remove the shroud that covers the steering column. This usually involves removing screws or clips. Be gentle to avoid breaking the plastic. Use your trim removal tool if necessary.
* Steering wheel removal (possibly): In some cases, you might need to remove the steering wheel to access the dimmer switch completely. If this is necessary, carefully mark the steering wheel's position relative to the steering column before removing it. Be aware that the steering wheel contains the airbag in newer vehicles, but likely not in a 1987 model. However, proceed with caution. A steering wheel puller might be necessary.
3. Replacing the Dimmer Switch:
* Disconnect the wiring harness: Carefully disconnect the wiring harness connector from the old dimmer switch. Take pictures or make notes of the wire positions before disconnecting to ensure correct reconnection.
* Remove the old dimmer switch: This usually involves unscrewing the switch from its mounting location.
* Install the new dimmer switch: Carefully install the new dimmer switch in the same position as the old one. Ensure it's securely fastened.
* Reconnect the wiring harness: Reconnect the wiring harness to the new dimmer switch, matching the wire positions to your notes or pictures.
* Reassemble: Reinstall the steering column shroud and steering wheel (if removed), making sure everything is securely fastened.
4. Testing:
* Reconnect the battery: Reconnect the battery's negative (-) terminal.
* Test the dimmer switch: Turn on your headlights and test the dimmer switch to ensure it's functioning correctly.
Important Considerations:
* Year and model variations: The exact location and access method for the dimmer switch can vary slightly between different 1987 Chevy pickup truck models.
* Professional help: If you're not comfortable working on your vehicle's electrical system, it's always best to seek professional help from a qualified mechanic. Incorrect wiring can cause damage to your truck's electrical system.
* Safety First: Always prioritize safety. Work in a well-lit area and take precautions to avoid electrical shock.
This guide provides a general overview. Referencing a repair manual specific to your 1987 Chevy truck model is strongly recommended for detailed, accurate instructions. A Haynes or Chilton manual is a good place to start. You can also find helpful information on online forums dedicated to classic Chevy trucks.
