MultiFunction Switches used on '92-up Ford trucks, other Ford products, & other vehicles including the Nissan Quest. There are electrical & functional variations, including the Hazard switch & the presence of cornering contacts or a rear interval wiper control. The stalks are interchangeable, but disassembling the switch requires patience & precision to keep all the tiny parts in-place. '92-97 F-series/Broncos use Motorcraft SW5591.

See this for testing:
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'97~03 trucks are also known to have a short wiring harness takeout for this switch, resulting in connector terminal pullout if the wheel is tilted fully down. The repair is to pull (hard) some slack into the wires, then insert the terminals into a new connector shell.
Upper Connector Motorcraft WPT-611
Lower Connector Motorcraft WPT-179

It's very common for older MFSs to slowly stop working, and replacements range from $40-200, so repairing it is certainly an option to consider. '92-97 F-series/Broncos use Motorcraft SW5591. To access & remove the switch, see this album:



Once the switch is out, you'll need a T10 driver, a small flat-blade screwdriver, electrical contact cleaner, fine steel wool or emery paper, some silicone electrical grease (NOT dielectric), and some paper towels IF YOU WANT to attempt to repair it yourself. If you fail, you haven't really cost yourself anything but a little time.

See this for testing:
. .

Hold the case together firmly as the screws are removed. The springs are near the hazard button, so take those screws out last. Push the lever forward to the Hi-Beam position, and turn the hazards OFF (not like this pic).

The parts will be loose as soon as the case separates, so hold it this way. Sliding the top slightly toward center will disengage the beam select slider (unlike this pic where that slider stayed on the lever), making it easier to split the case.

While splitting the case, release the catch on the wiper connector using a fine flat screwdriver or probe through this access hole. It will still take some force to pull the front case up off the connector, and the lever MUST be held down against the rear case half.

At all times, make SURE the lever stays fully down on the rear case half, including when you set the assembly down. If it slips up & off, it will be difficult to reassemble all the springs & pieces, and I'm not going into that.

There are several possible failures, and this may be a rare one: the main headlight wiper overheated. Note that this switch contains a wiper for cornering lights, and has a revised hazard wiper layout.

This is probably the most common failure: simple corrosion of the contacts & wipers. All circuits will be intermittent, and failure will become progressively worse.

These are the functions of the wipers & sliders. If you can't read the text labels in the image, click it to supersize. The black peg in the white sleeve in the center above my finger is the turn signal cancel lever.

Normal (hazard & turns OFF, low beam):
- The Beam Select wiper on the headlight slider joins the Headlamp & Lo Beam contacts; the FtP wiper on the headlight slider rests on the Hi Beam contact.
- The J2 hazard wiper joins Jumper 2 to the Brake Switch contact.
- The Flasher wiper on the hazard slider joins the Turn Flasher contact to Jumper 1.
- The Cornering wiper on the turn slider rests on the Headlamps contact & the dead pad between the corner light contacts.
- The L wiper on the turn slider joins Jumper 2 to the LHR contact.
- The R wiper on the turn slider joins Jumper 2 to the RHR contact.

These are the functions of the contacts. If you can't read the text labels in the image, click it to supersize.

Normal (hazard & turns OFF, low beam):
- The Beam Select wiper on the headlight slider joins the Headlamp & Lo Beam contacts; the FtP wiper on the headlight slider rests on the Hi Beam contact.
- The J2 hazard wiper joins Jumper 2 to the Brake Switch contact.
- The Flasher wiper on the hazard slider joins the Turn Flasher contact to Jumper 1.
- The Cornering wiper on the turn slider rests on the Headlamps contact & the dead pad between the corner light contacts.
- The L wiper on the turn slider joins Jumper 2 to the LHR contact.
- The R wiper on the turn slider joins Jumper 2 to the RHR contact.

Rear case assembly

Rinse the contacts with electrical contact cleaner, then polish them with fine steel wool or emery paper. The headlight slot will be the most difficult, so don't score the contacts with the screwdriver blade. Use a wood or plastic stick if necessary.

The silver terminals & the 3 copper ones at the L don't need to be cleaned. If the vehicle doesn't have cornering lights, the top 3 copper ones don't need to be cleaned.

Cleaning the wipers is more difficult because they're spring-loaded, and some are on loose parts. Keep the lever held down in the rear case at all times.

Once all the contacts are clean, apply a light film of silicone electrical grease (NOT dielectric, thermal, or chassis; or battery snot, or anti-seize, or conductive grease), then carefully reassemble the switch. It may be necessary to use a piece of paper to ramp the headlight contacts into their slot. Install a screw near the hazard switch first. '92-97 F-series/Broncos use Motorcraft SW5591.

Upper Connector Motorcraft WPT-611
Lower Connector Motorcraft WPT-179
Electrical Grease (F8AZ-19G208-AA)

To clean the wiper switch, it's not necessary to remove the MFS from the column. Just pop the cap off the end.

To clean the wiper switch, it's not necessary to remove the MFS from the column. Just pop the cap off the end.

To clean the wiper switch, it's not necessary to remove the MFS from the column. Just pop the cap off the end and remove the screw while holding the collar on.

As the collar comes off, watch for the detent pins & spring to fall out (the brass pin near the word "OFF").

Before removing the switch guts, note the position for reassembly. This shows the switch in the OFF position.

After cleaning the contacts (with Electrical Contact Cleaner), apply a light film of silicone electrical grease, and reassemble the switch. Use a toothbrush to clean the collar's knurling. Use grease to retain the detent pins while reassembling the switch & collar.


Electrical Grease (F8AZ-19G208-AA)