1. Preparation:
* Safety First: Disconnect the negative battery cable to prevent accidental short circuits.
* Gather Tools: You'll likely need a trim panel removal tool (plastic pry tool), a Phillips head screwdriver (possibly a Torx depending on your mirror), and possibly a 10mm socket and ratchet (depending on the mounting). Have a clean rag handy.
* Consult a Repair Manual: A factory service manual or a reputable online repair guide specific to your 1998 Ford F-150 will be invaluable. Pictures are your friend! This will show you exactly how your mirror is mounted and wired.
2. Removing the Old Mirror:
* Interior Door Panel Removal: This is usually the first step. Carefully pry off the interior door panel using your trim panel tool. Start at the edges and work your way around, being gentle to avoid breaking any clips. There are usually screws hidden behind the armrest or other interior components. Refer to your repair manual for specific locations.
* Mirror Connector Disconnection: Once the door panel is removed, locate the electrical connector for the mirror. Carefully disconnect it.
* Mirror Mounting Bolts/Clips: This is where your repair manual comes in handy. Locate the bolts or clips holding the mirror to the door. These are typically on the back of the mirror housing, accessible after the door panel is removed. Remove these fasteners.
* Removing the Mirror Assembly: With the electrical connector disconnected and the mounting bolts/clips removed, carefully pull the mirror assembly away from the door. It might require a bit of gentle persuasion.
3. Installing the New Mirror:
* Reverse the Removal Process: Install the new mirror assembly by aligning it with the mounting points on the door. Secure it with the bolts/clips.
* Reconnect the Electrical Connector: Carefully connect the electrical connector to the new mirror.
* Reinstall the Door Panel: Carefully snap the door panel back into place. Make sure all the clips engage correctly.
* Reconnect the Battery: Reconnect the negative battery cable.
4. Testing:
* Test the Functionality: Test the new mirror's power adjustment, heating (if equipped), and turn signal (if equipped).
Important Considerations:
* Mirror Type: Ensure you purchase a replacement mirror that matches your existing one. This includes features like power adjustment, heated glass, and turn signal indicators. The part number on your old mirror will help you find the correct replacement.
* Used vs. New: Used mirrors might be cheaper, but they could have hidden issues.
* Professional Help: If you're uncomfortable with any part of this process, it's best to take your truck to a qualified mechanic. This is especially true if you're not mechanically inclined.
Remember, this is a general guideline. Always refer to a repair manual specific to your 1998 Ford F-150 model and trim level for detailed instructions and diagrams. Improper installation could damage your door panel or the electrical system.
