1. Preparation:
* Gather Tools: You'll need a Phillips head screwdriver, possibly a flathead screwdriver, a socket set (likely including metric sizes), a wiring diagram specific to your 1990 Bronco (highly recommended!), and possibly some electrical tape.
* Steering Wheel Removal (Possibly): Depending on your Bronco's setup, you might need to remove the steering wheel to access the ignition switch. This usually involves using a steering wheel puller (available at most auto parts stores) and carefully marking the steering wheel's position relative to the steering column before removal to ensure proper realignment. If you're unsure, skip this step and see if you can access the switch without it.
* Column Covers Removal: You'll need to remove the plastic covers surrounding the steering column. These are usually held on with screws. Be careful not to break any clips.
2. Accessing the Ignition Switch:
* Locate the Switch: The ignition switch is usually located behind the steering column, relatively low down. Refer to your wiring diagram to identify its location precisely.
* Disconnect Wiring: Carefully disconnect all the wiring harnesses connected to the ignition switch. Take photos or make notes of the wiring connections *before* disconnecting to ensure proper reassembly. Labeling the wires is strongly advised.
* Remove the Switch: This is where things can get tricky. The switch is usually held in place by screws or a retaining clip, and sometimes there's a retaining ring. Your wiring diagram and a service manual (available online or at auto parts stores) are invaluable here, showing how the switch is secured. You may need to carefully pry or manipulate certain parts to free the switch. Be gentle to avoid damaging anything.
3. Replacing the Actuator Switch:
* Install the New Switch: Carefully install the new ignition switch in the reverse order of removal. Ensure that all the components are correctly seated and the retaining mechanisms are securely fastened.
4. Reconnection and Testing:
* Reconnect Wiring: Carefully reconnect all the wiring harnesses to the new ignition switch, ensuring that each wire is connected to its proper location. Double-check your work against your notes or photos.
* Reinstall Column Covers: Carefully reinstall the plastic column covers.
* Reconnect Battery: Reconnect the negative battery terminal.
* Test the Ignition: Test all ignition positions (accessory, ignition, start) to ensure that everything is working correctly.
Important Considerations:
* Wiring Diagram: This is essential. A wiring diagram specifically for your 1990 Ford Bronco will show you the location of the ignition switch, the wiring harness connections, and the proper way to reassemble everything.
* Service Manual: A service manual will provide detailed instructions and diagrams for this repair, making the process much smoother.
* Professional Help: If you're uncomfortable working with automotive electrical systems or feel unsure about any step, it's best to take your Bronco to a qualified mechanic. Improperly installing the ignition switch can lead to serious problems.
Remember, safety is paramount. Always disconnect the negative battery terminal before working on the ignition system. If you damage any wiring during the process, it could result in costly repairs. Proceed with caution, and if you are unsure at any point, consult a professional.
