1990-1997 Ford, Lincoln & Mercury Combination Switch: Fixing Failing Wipers & Turn Signals

Symptoms of a Failing Combination Switch

When a combination switch begins to fail, it can cause strange and intermittent electrical problems. Because it controls multiple systems, a single faulty switch can make it seem like your car has several unrelated issues. Watch for these common signs:

• Turn Signal Problems: This is the most frequent symptom. Your turn signals may not work at all, work only sometimes, or fail to cancel after you complete a turn. In some cases, the hazard lights will work properly, but the individual turn signals won't, pointing directly to the switch.
• Windshield Wiper Malfunctions: The wipers may not turn on, only work on a single speed, stop in the middle of the windshield, or operate intermittently on their own.
• Headlight and High Beam Issues: You may have trouble switching between low and high beams, or the high beams won't stay on. The 'flash-to-pass' feature might also stop working.
• Multiple Functions Fail at Once: A classic sign of a bad combination switch is when several of its functions (e.g., wipers and turn signals) act up at the same time. This indicates a problem with the switch itself rather than individual bulbs, fuses, or motors.
• Stalk Feels Loose or Stiff: The physical lever may feel loose, require extra force to operate, or make grinding sounds, indicating internal mechanical wear.

Known Issues, Recalls, and Vehicle-Specific Information

While there are no major recalls specifically for the combination switch on these models, there are critical safety recalls for related components on some of the covered vehicles that owners should be aware of.

• 1990-1995 Ford Taurus & Mercury Sable: 🎬 Watch: Taurus and Sable multifunction switch replacement These models are known to have the combination switch fail from high use over time. A recall (NHTSA 89V171000) was issued for 1990 models equipped with the 'autolamp' system for a faulty light sensor that could cause the headlights to fail, though this is separate from the combination switch itself.
• 1994-1997 Ford Thunderbird & Mercury Cougar: These models, built on the MN12 platform, were part of a massive recall for the ignition switch (NHTSA 96V071000), not the combination switch. The ignition switch could short circuit and cause a fire in the steering column, even when the car is off. If you own one of these vehicles, it is critical to check if this recall was performed.
• 1993 Lincoln Mark VIII: Like the Thunderbird and Cougar, the Mark VIII is also an MN12 platform car and may be affected by the ignition switch fire recall. When diagnosing signal problems, if the hazards work but the turn signals do not, the multi-function switch is the most likely cause.
• All Vehicles with Cruise Control: Many Ford vehicles from this era, including the Taurus SHO, were recalled for a faulty speed control deactivation switch located under the hood on the brake master cylinder (NHTSA 05S28). This switch could leak brake fluid, short out, and cause an underhood fire, even with the vehicle parked and off.

Buying a Used Combination Switch: What to Check

A used OEM combination switch can be a reliable and cost-effective alternative to expensive new parts or lower-quality aftermarket options. Here’s what to inspect before you buy.

1. Verify Cruise Control Style: First, look at your original switch. Does it have cruise control buttons on the stalk? The replacement part must match. If your car has cruise control on the steering wheel, the combination switch will have a plain, capped end.
2. Inspect the Electrical Connectors: This is critical. Look closely at the electrical connector ports on the switch. Ensure there are no bent, broken, or corroded pins. Check for any signs of melting or heat damage 🎬 Watch: How to replace a Ford switch and de-pin connectors on the plastic housing, which could indicate a more serious electrical issue in the vehicle.
3. Check the Stalk and Markings: Examine the plastic stalk for cracks or stress marks, especially at the base where it meets the steering column. Ensure the white lettering for the wiper and light functions is clear and not worn away.
4. Test the Mechanical Action: If possible, move the stalk through its functions. It should click into place for turn signals and move smoothly for the wiper settings. It shouldn't feel overly loose or gritty.
5. Why Used OEM? Original Ford (Motorcraft) switches were built to a high standard. A good, clean used OEM part is often more durable and provides a better fit than a brand-new, cheaply made aftermarket switch, which can fail prematurely.

Replacement Overview & Difficulty

• Difficulty: 2/5 (Easy to Moderate)
• Estimated Time: 0.5 - 1.5 hours
• DIY Feasible: Yes, for most DIY mechanics with basic tools.

Replacing the combination switch is a straightforward job. The main challenge is working in the tight space around the steering column. The general process is as follows:

1. Disconnect the Battery: Always disconnect the negative battery terminal before working on electrical components.
2. Remove Steering Column Covers: Remove the screws (typically Phillips or Torx) holding the upper and lower plastic shrouds around the steering column and separate them.
3. Remove Ignition Lock Cylinder (If Needed): On some models like the Taurus/Sable, you may need to remove the ignition lock cylinder to get the top cover off. To do this, turn the key to the 'ON' position, and press the small release pin on the bottom of the cylinder with a pick or small screwdriver to pull the cylinder out.
4. Unbolt the Switch: The combination switch is typically held to the steering column with two Torx screws (often a T15 or T20 size). Remove these screws.
5. Disconnect and Replace: Carefully pull the old switch out, then press the release tabs on the two large electrical connectors 🎬 See this step-by-step Ford multifunction switch replacement to unplug them. Plug in the new switch, bolt it into place, and reassemble the column covers.

Cost to Replace a Combination Switch

Costs can vary based on the part source and whether you perform the labor yourself. Aftermarket parts are widely available, but quality can be inconsistent.

Frequently Asked Questions (FAQ)