How do you replace the solenoid switch in a 1999 mercury sable?

To replace the solenoid switch in a 1999 Mercury Sable, first, disconnect the battery to ensure safety. Locate the solenoid switch, usually mounted on the starter motor, and remove the electrical connections and mounting bolts. Replace it with a new solenoid switch, reattach the electrical connections, and secure it with bolts. Finally, reconnect the battery and test the vehicle to ensure proper operation.