How do you replace the ignition lock on 1985 pickup?

To replace the ignition lock on a 1985 pickup, first disconnect the negative battery terminal to prevent any electrical issues. Remove the steering column cover by unscrewing it, then locate the ignition switch and remove any retaining screws. Disconnect the wiring harness from the ignition lock cylinder, insert the new lock cylinder, and reassemble the steering column. Finally, reconnect the battery and test the new ignition lock to ensure it functions properly.