Here's a general outline. Specific details might vary slightly depending on the exact trim level and options on your truck. Consult a repair manual specific to your 1985 Ford Ranger for precise instructions and diagrams. A Haynes or Chilton manual would be ideal.
Tools you'll likely need:
* Socket set (various sizes)
* Screwdrivers (Phillips and possibly flathead)
* Pliers
* Wire cutters/strippers (possibly)
* Electrical tape
* New ignition switch (ensure it's the correct one for your Ranger)
* Possibly a small pry tool
* Pen and paper (to label wires if necessary)
Steps:
1. Disconnect the battery: This is crucial to prevent electrical shocks and short circuits. Disconnect the negative (-) terminal first.
2. Remove the steering wheel: This is usually held on by a bolt or nut in the center. You'll need a special steering wheel puller tool to safely remove it without damaging the steering wheel or column. Be aware of the airbag if your truck had one, though likely not on an '85.
3. Access the ignition switch: The ignition switch is usually located behind the steering column. You'll likely need to remove the steering column shroud or bezel (the plastic cover around the column). This typically involves removing screws and possibly some clips. Carefully pry it loose if necessary.
4. Disconnect the wiring harness: The ignition switch will have a wiring harness connected to it. Before disconnecting, take pictures or make a detailed diagram of how the wires are connected. Labeling each wire with its function (if possible) is highly recommended to avoid confusion during reassembly. Use wire tags or carefully label the wires with tape and a pen. Take note of the wire colors and their positions.
5. Remove the ignition switch: This is usually held in place by screws or a retaining clip. You may need to carefully pry it out. Again, refer to your repair manual for specific instructions.
6. Install the new ignition switch: Insert the new ignition switch into its housing, making sure it's correctly seated. Secure it with the screws or clip.
7. Reconnect the wiring harness: Carefully connect the wiring harness to the new ignition switch, making sure each wire is in the correct position. Double-check your diagram or photos to ensure you have everything correct.
8. Reassemble: Reinstall the steering column shroud or bezel, then reattach the steering wheel using the steering wheel puller tool in reverse.
9. Reconnect the battery: Reconnect the negative battery terminal.
10. Test the ignition switch: Turn the ignition key to verify that all functions (starter, accessories, ignition) are working correctly.
Important Considerations:
* Repair Manual: A repair manual specific to your 1985 Ford Ranger is highly recommended. It will provide detailed diagrams and instructions tailored to your specific vehicle.
* Safety: Always disconnect the negative battery terminal before starting any work on the electrical system.
* Wiring: Take great care when disconnecting and reconnecting the wiring harness. Incorrect connections can lead to electrical damage or failure.
* Professional Help: If you are not comfortable performing this repair, it is best to take your vehicle to a qualified mechanic. Improper installation could lead to problems with your truck's starting and electrical system.
This is a general guide. The exact procedure may vary, so always refer to a repair manual specific to your vehicle's year, make, and model. Take your time, be careful, and if you're unsure about any step, seek professional assistance.
