1990-1995 Ford & Mercury Combination Switch: Taurus, T-Bird, Cougar & Mark VIII Failure Guide
Diagnose a faulty turn signal, wiper, and dimmer stalk and learn the critical compatibility differences before buying a replacement for your Ford Taurus, Thunderbird, Mercury Cougar, Sable, or Lincoln Mark VIII.
- This switch fits 1990-1993 Thunderbird/Cougar; the 1994-1997 models use a different part due to an interior redesign.
- It is only for vehicles with manual headlights. It is NOT compatible with the optional 'Autolamp' automatic dimming feature.
- Failure of turn signals, wipers, and high beams are the most common symptoms. Multiple failures at once strongly point to this switch.
- A critical fire recall (NHTSA 96V071000) exists for the separate ignition switch in the steering column of many of these cars; ensure this has been repaired.
Critical Compatibility Warnings for Buyers
Before purchasing a replacement combination switch, you must verify two key features for your vehicle to avoid buying the wrong part. These vehicles had several variations that are not interchangeable.
1994-1997 Thunderbird & Cougar Use a Different Switch: This guide and the compatible parts listed apply to the 1990-1993 Ford Thunderbird and Mercury Cougar. In 1994, these two models received a major interior redesign that included a new dashboard and dual airbags. This change also included a different steering column and combination switch. A switch for a 1990-1993 model will NOT fit a 1994-1997 model, and vice-versa.
2. Manual vs. Automatic Headlamp Dimming: This switch is for vehicles with manual headlamp dimming only. Some higher-trim models were equipped with an optional 'Autolamp' feature 🎬 Watch: How Ford's Autolamp system works that automatically turns the headlights on in low light and may control the high beams. Vehicles with this feature use a different, incompatible combination switch. Check your headlight controls; if you do not have an 'Auto' setting, this switch is likely correct.
Symptoms of a Failing Combination Switch
When a combination switch wears out, the internal electrical contacts break down, leading to a variety of frustrating symptoms. Often, the problems will be intermittent at first. You may notice one or more of the following:
- Turn Signal Problems: This is the most common failure. Signals may not work at all, only work on one side, or flash intermittently. You might have to hold the lever in place to keep the signal on. In some cases, the hazard lights will work properly, but the individual turn signals won't.
- Headlight and High Beam Issues: You may have trouble switching between low and high beams, or the high beams won't stay on. Sometimes, the headlights may flicker or fail to turn on at all.
- Windshield Wiper Malfunctions: The wipers might only work on one speed, operate intermittently, or stop working entirely. The washer function may also fail.
- Multiple Failures at Once: If your turn signals, wipers, and high beams all start having issues around the same time, it's a very strong indicator that the combination switch is the root cause.
Important Safety Recall: Ignition Switch Fire Hazard
Many of these vehicles, including the 1988-1993 Ford Thunderbird and Mercury Cougar, were part of a massive recall (NHTSA Campaign ID: 96V071000) for a faulty ignition switch. This is a separate part from the combination switch, but it is located in the same steering column area. A short circuit in the ignition switch could cause overheating, smoke, and potentially a fire, even when the vehicle is turned off and unattended. It is critical to ensure this recall repair has been performed on your vehicle. An authorized dealer can check your VIN to see if the recall applies and has been completed.
Buying a Used Combination Switch
A used OEM combination switch is an excellent, cost-effective alternative to expensive new parts, which may no longer be available from the manufacturer. Since this is a high-wear item, however, there are a few things to check before you buy.
- Physical Inspection: Check the plastic housing for any cracks, especially around the mounting points. Move the stalk through all its functions (up/down for signals, twist for wipers, push/pull for high beams). It should move with a solid, defined click and should not feel loose, gritty, or sloppy.
- Inspect the Markings: The white graphics printed on the stalk should be clear and not worn off. Heavily worn markings can indicate very high mileage and use.
- Check Electrical Connectors: This is the most important check. Look closely at the male pins in the electrical connectors. They must be straight, clean, and free of any green or white corrosion. Bent or corroded pins will cause the switch to fail.
- Verify Part Numbers: If possible, match the OEM part number from your original switch to the replacement. Common part numbers for this switch include E9SZ-13K359-B, E9SZ-13K359-C, and E9SZ-13K359-D.
- Confirm Compatibility: Re-confirm that the switch is from a vehicle without automatic headlamp dimming and, for Thunderbird/Cougar owners, that it is from a 1990-1993 model.
Replacement Overview & Difficulty
Replacing the combination switch is a straightforward job that most DIY mechanics can complete in about an hour. The steering wheel does not need to be removed.
- Difficulty: 2/5
- Estimated Time: 1 hour
- Tools Needed: Phillips screwdriver, Torx driver (T15 or T20), small flat-blade screwdriver, socket set.
General Steps:
- Disconnect the negative battery terminal.
- Remove the plastic shrouds (covers) from around the steering column. This usually involves removing a few Phillips or Torx screws from the underside.
- Some models may require you to remove the ignition lock cylinder to get the covers off. To do this, turn the key to the 'RUN' position and press a small release button on the bottom of the cylinder housing.
- Locate the combination switch mounted to the steering column. Remove the two Torx screws holding it in place.
- Carefully pull the switch away from the column and disconnect the electrical connectors at the back. 🎬 See this step-by-step Ford multifunction switch replacement There are typically two or three connectors with release tabs that may require a small screwdriver to depress.
- Connect the new switch, bolt it into place, reassemble the column covers, and reconnect the battery to test for function.
Cost of a Replacement Combination Switch
Prices can vary based on condition and supplier. Labor for a professional installation typically costs between $95 and $125.
| Part Type | Estimated Price Range |
|---|---|
| New OEM | $130 - $160 (if available) |
| New Aftermarket | $45 - $80 |
| Used OEM | $25 - $60 |
| Shop Labor | $95 - $125 |
Frequently Asked Questions (FAQ)
My hazard lights work, but my turn signals don't. Is it still the combination switch?
Yes, this is a classic symptom of a failing combination switch. The hazard light function runs through a slightly different circuit path than the individual turn signals, so it's common for one to work when the other fails.
Do I need to remove the steering wheel to replace this switch?
No, the steering wheel does not need to be removed for this job. The switch can be accessed by simply removing the plastic covers around the steering column.
My turn signals are flashing really fast. Is the switch bad?
Rapid flashing, or 'hyper-flash', is almost always caused by a burnt-out turn signal bulb somewhere on the car, not the combination switch. The change in electrical resistance from the dead bulb causes the flasher relay to blink quickly. Check all your signal bulbs before replacing any other parts.
Is the combination switch the same as the ignition switch?
No, they are two separate parts. The combination switch is the stalk for your lights and wipers. The ignition switch is the electrical component connected to the lock cylinder where you insert your key. Be aware that these vehicles were recalled for a dangerous ignition switch fault that could cause a fire.
Helpful Videos
Technical Specifications
OEM Part Numbers: E9SC-13K359-BA E9SC-13K359-CA E9SC-13K359-DA E9SZ-13K359-B E9SZ-13K359-C E9SZ-13K359-D F0DC-13K359-BC F1DC-13K359-AA
Controls turn signals, high/low beam headlights, and windshield wiper/washer functions. Designed for vehicles without automatic headlamp dimming. Does not have integrated cruise control buttons.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ford Thunderbird:
- Mercury Cougar:
- Ford Taurus:
- Lincoln Mark VIII:
- Mercury Sable: