Ignition Switch Guide for the 1970-1983 Buick Estate Wagon
Having trouble starting your classic wagon? The ignition switch might be the culprit.
- The ignition switch is a common failure point due to age, causing no-start conditions or stalling.
- It's an electrical part on the steering column, separate from the mechanical lock cylinder your key enters.
- No specific recalls exist for this part on the 1970-1983 Estate Wagon; the major GM recalls were for newer cars.
- Replacement is a manageable DIY task that involves lowering the steering column for access.
Is Your Ignition Switch Failing?
After decades of use, the internal contacts inside the ignition switch on your 1970-1983 Buick Estate Wagon can wear out, get corroded, or fail due to heat. This can cause a range of frustrating electrical problems. Since these classic wagons don't have complex computer systems, diagnosing issues is often straightforward. Here are the common signs of a bad ignition switch.
Symptoms of a Bad Ignition Switch
Engine Won't Crank or Start
You turn the key and nothing happens, or you only hear a single click. If your battery is good, the ignition switch may not be sending the signal to the starter motor. Sometimes the car will start but then immediately stall because the switch fails to provide continuous power to the ignition system.
Car Stalls While Driving
This is a serious symptom. A worn switch can lose connection due to vibrations or bumps in the road, cutting power to the engine and causing it to shut off unexpectedly. This will also result in a loss of power steering, making the car difficult to control.
Intermittent Electrical Problems
Your dashboard lights might flicker, or the radio and other accessories may cut in and out. This happens because the switch isn't maintaining a solid electrical connection for the accessory circuits.
Key Turns But Nothing Happens
If the key turns in the cylinder but there's no response from the car—no dash lights, no crank—the ignition switch is a primary suspect. This indicates a total failure to distribute power from the battery.
Choosing the Right Aftermarket Ignition Switch
For a vehicle like the 1970-1983 Estate Wagon, OEM (Original Equipment Manufacturer) parts from GM are no longer produced. Luckily, the aftermarket offers several good-quality options. The ignition switch used in these wagons was a common part for many GM vehicles of the era, so replacements are readily available.
| Brand Tier | Brands | Quality & Price Assessment |
|---|---|---|
| Premium Aftermarket | Standard Ignition (SMP) | Standard Ignition is a well-regarded brand that often serves as an original equipment supplier. Their parts are known for fitting correctly and being reliable, making them a trusted choice for many professional mechanics. Reviews for their switches on similar GM vehicles are generally positive. Expect to pay a bit more for this quality. |
| Standard Aftermarket | Rostra Powertrain | Rostra produces a wide range of automotive electronics for both OEM and aftermarket applications. While specific reviews for this application are scarce, they are generally considered a reliable mid-tier option that provides a balance of quality and affordability. |
| Economy | Replacement | This is typically a generic or "white-label" brand. These switches are the most affordable and can be a functional option for a budget repair. However, quality can be inconsistent compared to more established brands. They are a viable choice if cost is the primary concern. |
Lock Cylinder vs. Ignition Switch
It's a common mistake to confuse the ignition lock cylinder (the mechanical part your key goes into) with the ignition switch (the electrical part). If your key is hard to turn or gets stuck, the problem is likely the lock cylinder. If the key turns fine but you have electrical or starting issues, the ignition switch is the more likely culprit. Since you have to take the steering column apart for either job, many owners choose to replace both at the same time.
Estimated Replacement Costs
The cost to replace the ignition switch is reasonable, as the parts are not expensive. Labor is the biggest variable.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Ignition Switch | $20 - $42 |
| Shop Labor | $100 - $200 |
| Total Estimated Cost | $120 - $242 |
Note: Costs are estimates and can vary based on your location and the specific repair shop.
DIY Installation Tips
Replacing the ignition switch is a manageable DIY job for someone with basic mechanical skills. The switch is located on top of the steering column, accessed from under the dashboard. You will need to lower the steering column to get to it. Always disconnect the battery before starting any electrical work. The switch is actuated by a rod connected to the lock cylinder, so you'll need to align the new switch correctly during installation. Numerous videos are available online showing this procedure on similar 1970s and 80s GM cars.
Frequently Asked Questions
Are there any recalls for the ignition switch on my Buick Estate Wagon?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls for the ignition switch on the 1970-1983 Buick Estate Wagon. The widely publicized GM ignition switch recalls from the 2010s affected much newer vehicles (2003-2007 models) and were related to a different switch design and failure mode.
Do I need special tools to replace the ignition switch?
No special tools are typically required to replace just the ignition switch. Basic hand tools like a socket set and screwdrivers are usually sufficient to lower the steering column and access the switch. However, if you decide to replace the ignition lock cylinder at the same time, you will need a steering wheel puller and a lock plate compressor tool.
Is an aftermarket ignition switch as good as the original?
For this vehicle, a quality aftermarket part from a reputable brand like Standard Ignition can be as good as or even better than the original, which is now over 40 years old. Aftermarket companies sometimes improve upon original designs to fix known weak points. Given that new OEM parts are unavailable, a new aftermarket switch is the best option.
What is the difference between a switch for a tilt vs. non-tilt steering column?
For some GM vehicles of this era, there were different ignition switches for cars with or without a tilt steering wheel. It is important to verify which type your Estate Wagon has before ordering. The physical mounting and actuator rod engagement can differ between the two. Most parts listings will specify if the switch is for a tilt or non-tilt column.
Technical Specifications
OEM Part Numbers: 1990084 1990090 1990098 1990115 1990105 1990109
The ignition switch for the 1970-1983 Buick Estate Wagon is a rod-actuated electrical switch mounted on the steering column. It typically features a 9-blade terminal connector. Different versions may exist for vehicles with and without tilt steering wheels.
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.