Here's a general outline of the process. Specific steps may vary slightly depending on the trim level and options on your truck. Always consult a repair manual specific to your year and model for detailed instructions and diagrams. A Haynes or Chilton manual is a good investment.
Tools You'll Likely Need:
* Screwdrivers: Phillips and flathead, various sizes.
* Socket set: Metric and/or SAE, depending on your truck.
* Wrench(es): Possibly a combination wrench or ratchet and sockets.
* Needle-nose pliers: For reaching small parts.
* Electrical tape: To secure wires if needed.
* Penetrating oil (PB Blaster or similar): To help loosen any stubborn screws or bolts.
* A new ignition switch: Ensure you get the correct replacement for your specific truck. The part number should be on the old switch.
General Steps (This is NOT a complete, step-by-step guide):
1. Disconnect the battery: This is crucial to prevent electrical shorts and injury. Disconnect the negative (-) terminal first.
2. Remove the steering wheel: This is often the most challenging part. You'll likely need a steering wheel puller tool. Note the position of the steering wheel before removal so you can reinstall it correctly. There are specific procedures for this; consult your repair manual.
3. Remove the steering column shroud: This usually involves removing screws and possibly some plastic trim pieces.
4. Access the ignition switch: You'll now have access to the ignition switch itself. It is usually held in place by screws or a retaining clip.
5. Disconnect the wiring harness: Carefully disconnect the electrical connectors from the ignition switch. Take pictures or make notes of the wire positions before disconnecting to ensure correct reassembly.
6. Remove the ignition switch: Carefully remove the retaining screws or clips holding the ignition switch in place.
7. Install the new ignition switch: Install the new ignition switch, ensuring it's properly seated.
8. Reconnect the wiring harness: Reconnect the wiring harness, matching the wires to their corresponding locations (refer to your notes or photos).
9. Reinstall the steering column shroud: Reassemble the steering column shroud.
10. Reinstall the steering wheel: Reinstall the steering wheel, making sure it's aligned correctly.
11. Reconnect the battery: Reconnect the battery's positive (+) terminal.
12. Test the ignition switch: Test the ignition switch to ensure it operates correctly.
Important Considerations:
* Steering wheel lock: Be very careful not to damage the steering wheel lock mechanism during removal and reinstallation. A misaligned steering wheel can cause problems.
* Wiring: Pay extremely close attention to the wiring. Incorrect reconnection can cause significant problems.
* Security: The ignition switch may have a security feature tied to the key. Make sure you have the correct key for the replacement switch.
This is a simplified overview. You absolutely should consult a repair manual specific to your 1990 Ford F-150 before attempting this repair. Incorrect installation can lead to serious problems, and it's always best to prioritize safety. If you're not comfortable with this type of work, seeking professional help is strongly recommended.
