How do you change the ignition switch on 1991 GMC S15 truck?

To change the ignition switch on a 1991 GMC S15 truck, first, disconnect the battery to prevent any electrical shorts. Remove the steering column cover by unscrewing the screws, then locate the ignition switch, which is typically mounted on the steering column. Disconnect the wiring harness from the old switch, unbolt it, and replace it with the new switch. Reassemble the steering column cover and reconnect the battery to complete the installation.