Mercury F4DZ-11572-B Switch Assembly - Ignition

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The ignition switch can be removed by disconnecting the cable from the negative battery terminal. The covers of the steering column and knee bolster should be removed. For old models, the column is lowered after removing the retention nuts. On new models, remove the metal reinforcement panel. Remove the switch screws and unplug its electrical connector. Disengage the actuator pin from the switch. To install, ensure the new switch is in the "Run" position. Place it on the actuator pin and install retaining screws. With that done connect the electrical connector then install the upper steering column cover. Lastly, raise the column and install nuts for retaining purposes. Install lower column covers then insulator panel.

As a process of replacement of the ignition switch, the user is advised to pull the cable off the negative terminal of the battery. Next, take out the centre trim panel and the driver's side knee bolster and the next are the steering column covers, and the tilt-column handle if any. Rotate the ignition key to the Run position and disconnect the electrical connector to the ignition switch and then remove the retaining screws. Remove the ignition switch from the actuator pin by pulling out the mentioned part of the switch from the car. Check that the actuator pin slot in the new ignition switch is located in the Run position, insert the new ignition switch on the actuator pin and tighten the retaining screws and using space provided, calibrate the screws for the alignment of the screw holes. That completes the removal of the cruise control but do the reverse in order to finish the installation and test the unit function in the lock, start and accessory positions. For the Ignition Lock Cylinder as well this requires disconnecting the cable from the negative terminal, rotating the key to the run position and driving a 1/8-inch punch into the hole at the bottom of the steering column cover surround the Ignition Lock Cylinder. Pull out on the Ignition Lock Cylinder while depressing the punch to eject it. To remove the cylinder for replacement, push on the pin near the last of the cylinder and turning a quarter counterclockwise from the Stop position to the Run position and the cylinder falls out of the interlocking washer which must be seated firmly. Finally, using the position of the key that is labelled 'Off', re-align it back to this state to enable proper positioning of the retaining pin into the situated locating hole; the same key should now be turned to confirm a proper working lock in all the respective created positions, finally, reinstalling the lock using the reverse procedure highlighted above.

Insert a 5/64-inch drill bit into the locking pin hole on the side of the switch.

On 1995 and later models, the ignition switch is secured to the underside of the steering column by two screws.

Disconnect the negative cable from the battery, and if equipped with an airbag, disconnect the positive cable as well.

In some later models, the switch is retained by a tab that fits the switch housing. You need to depress the tab to remove the switch.

Raise the steering column into position and install the retaining nuts. Tighten the nuts securely.

Turn the lock key to the Run position.

The remainder of the installation is the reverse of removal. Check for proper operation of the ignition switch in the lock, start, and accessory positions.

Connect the cable to the negative battery terminal.

An ohmmeter or self-powered test light is needed, along with the accompanying diagrams.

Disconnect the ignition switch electrical connector and remove the switch retaining screws (Unplug the electrical connector and remove the ignition switch retaining screws (arrows)).

1. Disconnect the electrical connector from the ignition switch. 2. To detach the ignition switch from the steering column, depress the release tabs on the top and bottom of the switch, then pull the switch out. 3. Installation is the reverse of removal.