Ignition Switch Guide for 1979-1986 GMC C2500 Suburban
Having trouble starting your classic GMC Suburban? It might be the ignition switch.
- A bad ignition switch can cause a no-start, stalling, or flickering lights.
- Rule out bad grounds and loose battery cables before replacing the switch.
- The ignition switch is an electrical part on the steering column, separate from the key lock cylinder.
- Standard Ignition is a well-regarded aftermarket brand for this part.
Is Your Ignition Switch Failing?
An ignition switch problem on your '79-'86 C2500 Suburban can mimic other issues, like a dead battery or a bad starter. Before you replace more expensive parts, check for these common symptoms. A failing switch can cause intermittent problems that are hard to track down. You might notice the truck stalls unexpectedly while driving, which can be a serious safety issue. Other times, it might refuse to start at all, with no clicking from the starter. Flickering dashboard lights or accessories that cut in and out are also classic signs.
Diagnose Before You Buy
Many starting and running problems on these older GM trucks are caused by poor ground connections, not a faulty switch. Before ordering a new part, check that the battery cables are clean and tight, and inspect the ground wires from the battery to the frame and engine block. Also, check if the switch's mounting screws on the steering column have simply come loose, which can cause adjustment and contact issues.
Choosing the Right Aftermarket Ignition Switch
For a vehicle of this age, finding a new OEM (Original Equipment Manufacturer) part from GM is nearly impossible. The aftermarket is your primary source, and the quality is generally very good for this component. Here’s a look at the available brands:
- Standard Ignition (Standard Motor Products): Often considered a top-tier aftermarket brand, Standard has a long history of producing reliable engine management and electrical parts. Technicians often trust them for meeting or exceeding original specifications. For a critical part like an ignition switch, this is a solid choice.
- Rostra Powertrain: Rostra is known for a wide variety of automotive electronics, including transmission components and cruise control systems. While not as specialized in ignition parts as Standard, they are a known aftermarket manufacturer.
- Replacement: This is typically a generic or house brand. The quality can be a bit of a gamble, but they are often the most affordable option. For a part that requires significant labor to access, weighing the cost savings against the potential for a shorter lifespan is important.
Pro Tip: Replace the Lock Cylinder at the Same Time?
The ignition switch is the electrical part on the column. The ignition lock cylinder is the mechanical part your key turns. If your key is getting sticky, hard to turn, or doesn't always engage the switch, you may want to replace the lock cylinder as well. Since you'll have the steering column apart, doing both at once can save you from having to do the job twice.
Cost of Replacing a 1979-1986 GMC C2500 Suburban Ignition Switch
The cost is relatively low for the part itself, with labor being the more significant expense if you have a shop do the work.
| Part | Estimated Cost |
|---|---|
| New Aftermarket Ignition Switch | $20 - $55 |
| Shop Labor | $150 - $250 |
| Total (DIY) | $20 - $55 |
| Total (Shop) | $170 - $305 |
Frequently Asked Questions
Will a bad ignition switch drain my battery?
Yes, a faulty ignition switch can fail to completely shut off accessory circuits when the key is removed, leading to a parasitic drain that can kill your battery overnight.
Why does my truck start sometimes but not others?
This is a classic symptom of a worn ignition switch. The internal contacts wear out and don't always make a solid connection. Wiggling the key might temporarily help, but it's a clear sign the switch is failing. However, also check for loose battery cables or a bad neutral safety switch.
Is replacing the ignition switch a DIY job?
Yes, for someone with mechanical experience. The process involves removing the steering wheel and the turn signal switch to access the lock cylinder and the actuator rod for the ignition switch. You will likely need a steering wheel puller and a lock plate compressor tool, which can often be rented from auto parts stores.
Are there any recalls for the ignition switch on this truck?
No, there are no specific recalls for the ignition switch on the 1979-1986 GMC C2500 Suburban. While GM had major recalls for ignition switches on much newer cars in the 2000s, they do not apply to this vintage of truck.
Technical Specifications
The ignition switch is a rod-actuated electrical switch mounted on the steering column. It is not the same as the ignition lock cylinder where the key is inserted.
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.