How do you replace the ignition switch?

I would take it to the dealer. Especially if you have an airbag.

REMOVAL

Battery Cable At Shock Tower

1. Disconnect battery negative cable from remote negative terminal on shock tower.
2. Unplug field circuit from generator.

Wiring Connections

1. Remove the B+ terminal nut and wire.
2. Loosen top mounting ear bolt.

Generator

1. Loosen pivot bolt, but do not remove. Be careful not to lose nut.
2. Loosen adjusting bolt on idler to allow removal of the generator drive belt. Refer to Cooling System.
3. Remove pivot bolt, do not drop spacer.
4. Remove top mounting ear bolt.
5. Remove upper generator bracket.
6. Remove generator.

INSTALLATION

1. For installation, reverse above procedures. Tighten all fasteners to the proper torque. Refer to the Torque Specifications chart at the rear Starting and Charging/Charging System/Charging.