1. Preparation:
* Safety First: Disconnect the negative battery cable before starting any work.
* Gather Tools: You'll need a variety of tools, including screwdrivers (Phillips and flathead), possibly sockets and wrenches (sizes will vary depending on the specific car), a wiring diagram (highly recommended), and possibly a plastic trim removal tool.
* Wiring Diagram: Obtain a wiring diagram specifically for your 1988 Cadillac Fleetwood Brougham. This is crucial for correctly connecting the wires to the new ignition switch. A Haynes or Chilton manual for your year and model would be invaluable. Failing that, try online resources dedicated to Cadillac repair.
* Take Pictures: Before disconnecting anything, take detailed photos of the wiring harness connections and the ignition switch's position. This will be invaluable when reassembling.
2. Removing the Steering Column:
* Steering Wheel Removal (if necessary): Some repairs might require removing the steering wheel. This involves disconnecting the horn wiring and using a steering wheel puller (rentable from auto parts stores). Be aware of the airbag, if equipped. Disconnect the battery first and follow the proper procedure for airbag removal to avoid accidental deployment.
* Column Removal: This involves removing various trim pieces surrounding the steering column. The exact procedure varies slightly between model years, but generally involves removing screws and plastic covers. Refer to your repair manual. You may need to carefully pry apart some plastic trim using plastic trim removal tools to avoid damage.
* Unbolting the Column: Once the trim is removed, you'll find bolts or screws securing the steering column to the car's body. Carefully remove these, allowing you to slightly lower the column to access the ignition switch.
3. Replacing the Ignition Switch:
* Disconnect Wiring Harness: Carefully disconnect the wiring harness from the old ignition switch. Again, take pictures or make detailed notes of the wiring connections before disconnecting.
* Remove the Old Switch: This usually involves removing screws or a retaining clip holding the switch in place.
* Install the New Switch: Carefully install the new ignition switch, ensuring it's properly seated.
* Reconnect Wiring Harness: Connect the wiring harness to the new switch, matching the wires exactly as they were on the old switch (using your pictures and/or diagram). Double-check every connection.
4. Reinstalling the Steering Column:
* Secure the Column: Carefully raise the steering column and re-secure it to the car's body using the bolts or screws you removed earlier.
* Reconnect Electrical Connections: This is where the power issues typically arise. Double-check ALL electrical connections at the steering column. There are often multiple connectors – look for any loose, corroded, or damaged connections. These often control the turn signals, wipers, and other functions. A loose or improperly seated connector is the most likely culprit for the power problem.
* Reattach Trim: Reinstall all the trim pieces and covers around the steering column.
5. Reconnect Battery and Test:
* Reconnect the Negative Battery Cable.
* Test the Ignition: Carefully test the ignition switch, ensuring all positions (accessories, ignition, start) function correctly.
* Test Other Functions: Check that all other functions controlled by the steering column (turn signals, wipers, etc.) are working.
Troubleshooting Power Issues:
* Check Fuses: If any functions aren't working, check the relevant fuses in the fuse box.
* Wiring Inspection: Carefully inspect all wiring connections for damage, corrosion, or loose connections. Pay close attention to the connections at the steering column itself.
* Ignition Switch Quality: In rare cases, the new ignition switch itself might be faulty.
Important Considerations:
* Steering Wheel Lock: Be mindful of the steering wheel lock mechanism. You might need to manipulate the steering wheel slightly during reassembly to disengage it.
* Professional Help: If you're uncomfortable working on your car's electrical system or steering column, consider seeking professional help from a qualified mechanic. This can prevent further damage or injury.
Remember, this is a general guide. Specific procedures might differ slightly depending on your particular vehicle's configuration. Always consult your repair manual for detailed instructions and diagrams. Taking your time and being methodical is crucial for successful repair.
