Q: How to remove and install the horn on a Mercury Mariner?
A: Loosen the left front wheel lug nuts. Raise the vehicle and secure it on jackstands. Remove the left front wheel. Remove the front bumper cover. Disconnect the electrical connector from the horn. To remove the horn, disconnect the electrical connector and remove the mounting nut. Remove the horn mounting nut and separate the horn from its mounting bracket. Installation is the reverse of removal.