Mercury Montego Ignition Switch Guide: 1968-1975 Problems and Replacement
Is your classic Montego refusing to start, stalling, or having electrical issues? Your ignition switch may be the culprit.
- A failing ignition switch is a very common problem on a 50+ year old Montego, causing no-start, stalling, and electrical accessory issues.
- The most dangerous symptom is the engine stalling while driving; if this occurs, stop driving the car immediately.
- For a reliable repair, choose a new aftermarket switch from an established brand like Standard Ignition.
- This is a very feasible DIY replacement for those with basic tools, as the switch is a simple mechanical component on the steering column.
Is Your Montego's Ignition Switch Failing?
After 50+ years of use, the original ignition switch in a 1968-1975 Mercury Montego is a common failure point. The internal electrical contacts wear down, and the plastic components can become brittle and break. This can cause a range of frustrating and potentially dangerous electrical problems. Before you blame the battery or starter, check for these classic signs of a bad ignition switch.
Top 5 Failure Symptoms
- Car Won't Start or Crank: You turn the key and get nothing but silence, or maybe a single click from the engine bay. Power isn't reaching the starter solenoid because the contacts inside the switch are worn out.
- Engine Stalls While Driving: This is a serious safety issue. The engine can suddenly shut off, especially when you hit a bump or turn the wheel. This happens because vibrations cause the worn switch to lose electrical contact, cutting power to the ignition system.
- Starts, Then Immediately Dies: The engine fires up when you're holding the key in the 'Start' position, but dies as soon as you let go and it returns to the 'On' position. This points to a failure in the 'run' circuit of the switch.
- Electrical Accessories Don't Work: The radio, wipers, heater fan, or dashboard lights flicker or don't work at all, even when the car is running. A Montego owner reported losing the AC, turn signals, radio, and gas gauge all at once, which can point to a faulty ignition switch.
- Key is Hard to Turn or Feels 'Gritty': While this can also be the lock cylinder, binding in the ignition switch can make it difficult to turn the key through its positions.
Safety First: Stalling Risk
A failing ignition switch that causes the engine to stall while driving is a critical safety hazard. You will lose power steering and power brakes, making the vehicle extremely difficult to control. If you suspect your switch is failing, it is not recommended to drive the vehicle until it is repaired.
Choosing the Right Aftermarket Ignition Switch
For a vehicle from this era, finding a 'New Old Stock' (NOS) OEM Ford part is nearly impossible and would be very expensive. Used parts from a salvage yard are an option, but they are just as old as the part you are replacing. A new aftermarket switch is the most practical and reliable choice.
Your main choices are between established brands and more budget-oriented options.
- Standard Ignition (Standard Motor Products): Often considered a top-tier aftermarket brand, SMP has been making electrical parts for decades. They have a strong reputation for quality and proper fit, with many professional mechanics and restorers trusting their components. For a critical part like an ignition switch, choosing a well-known brand like Standard is a solid investment in reliability.
- Rostra Powertrain: Rostra offers a more budget-friendly alternative. Their marketing states that their switches are direct-fit replacements made with high-grade materials and copper conductors, and are 100% tested for performance. While they claim OE-level performance, there are fewer independent reviews from classic car owners compared to Standard Ignition.
Pro Tip: Check the Lock Cylinder Too
While you are replacing the ignition switch, it's a good time to inspect the ignition lock cylinder (where your key goes in). If it's worn, sticky, or the original, consider replacing it at the same time. They are inexpensive and can prevent future starting problems.
Ignition Switch Replacement Cost for 1968-1975 Montego
Replacing the ignition switch is a manageable job for a DIYer with basic tools. The part itself is not expensive, with labor making up most of the cost if you take it to a shop.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Ignition Switch | $20 - $55 |
| Shop Labor | $150 - $300 |
| Total Professional Replacement | $170 - $355 |
Frequently Asked Questions (FAQ)
Is the ignition switch the same as the ignition lock cylinder?
No. The lock cylinder is the mechanical tumbler you put your key into. The ignition switch is the separate electrical part that the lock cylinder operates, usually via a connecting rod. On these classic Fords and Mercurys, the switch is typically mounted further down the steering column.
Can I replace the ignition switch myself?
Yes, this is a DIY-friendly job if you are comfortable working under the dashboard. The process generally involves removing the lower dash panels and the steering column support brace to let the column drop slightly. This provides access to the top of the column where the switch is held by two small bolts. No special tools are usually required beyond basic sockets and screwdrivers.
Do I need to worry about recalls for my Montego's ignition switch?
No. The major, well-publicized ignition switch recalls were for much newer General Motors vehicles and do not apply to your Mercury Montego. A search of the NHTSA database shows no recalls for the ignition switch on these models.
Will a new switch fix my key getting stuck?
It might. A binding ignition switch can make the key hard to turn. However, a worn-out key or a failing lock cylinder are more common causes for a key getting stuck. It's best to inspect both components during the repair.
Technical Specifications
Mechanical, steering column-mounted electrical switch. Actuated by a rod connected to the key lock cylinder.
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.