GMC Sprint Turn Signal Switch Guide (1971-1977)
Solving common signal, brake light, and hazard light problems starts with this critical part in your steering column.
- A faulty switch can cause your brake lights to fail, creating a serious safety risk.
- You MUST order the correct switch for your specific column type: tilt or non-tilt.
- Replacement is a moderately difficult DIY job that requires special tools like a steering wheel puller and lock plate compressor.
- Investing in a quality aftermarket brand like Standard Ignition is recommended for durability and to avoid repeating the complex installation.
Is Your Turn Signal Switch Failing? Common Symptoms
After five decades, the plastic and metal contacts inside the original turn signal switch wear out, get brittle, and break. This can lead to a variety of electrical issues. Watch for these common warning signs:
- No Turn Signals: The most obvious symptom is when signals don't work at all, only work on one side, or flash intermittently.
- Brake Lights Don't Work: A classic sign of failure on these trucks is when you lose your rear brake lights, but the turn signals might still function. This happens because the brake light circuit is integrated into the switch.
- Signals Don't Cancel: The switch contains a plastic canceling cam that is supposed to turn the signal off after you complete a turn. When this cam breaks, the signal lever won't return to the neutral position on its own.
- Hazard Lights Inoperative: If your 4-way emergency flashers don't work when you press the button, the switch is the likely culprit.
- Loose or Broken Lever: The lever itself can feel floppy, or the plastic components can become so brittle that it physically snaps off.
- Signals Only Work When Held: If the signal only flashes when you hold the lever in place, the internal mechanicals that are supposed to hold it have failed.
Choosing the Right Aftermarket Turn Signal Switch
Finding a new OEM turn signal switch from GM for a vehicle of this age is highly unlikely. The market consists of aftermarket replacements that fall into different quality tiers.
Brand Tiers
- Premium Aftermarket (Standard Ignition): Standard Motor Products (SMP), sold under the Standard Ignition brand, is a well-regarded name trusted by many professional technicians. They are known for producing reliable parts that meet or exceed original specifications, often using superior materials like copper alloy conductors for better performance. For a part that is labor-intensive to replace, investing in a quality switch from a brand like Standard is a wise choice for long-term reliability.
- Economy Aftermarket (Replacement): This category includes various budget-focused brands. While these switches will fit and function initially, they may not offer the same durability or lifespan as a premium part. Given the difficulty of the installation, saving a few dollars on the part itself may not be worth the risk of having to do the job again sooner.
You must know whether your Sprint has a standard (non-tilt) or an optional tilt steering column. The turn signal switches for each are different and are not interchangeable. Ordering the wrong part will mean it won't fit or function correctly.
Cost to Replace a 1971-1977 GMC Sprint Turn Signal Switch
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Switch | $66.54 - $94.76 |
| Shop Labor | $150 - $275 |
| Total Estimated Cost | $216 - $370 |
Frequently Asked Questions (FAQ)
Can I replace the turn signal switch myself?
Yes, if you are a confident DIY mechanic and have the required special tools (steering wheel puller and lock plate compressor). The process involves disconnecting the battery, removing the horn, pulling the steering wheel, compressing the lock plate, removing the old switch, and carefully fishing the new wiring harness down the steering column. It is considered a moderately difficult job that can take 1.5 to 2.5 hours.
Why did my brake lights stop working when the turn signal switch failed?
This is a very common and confusing symptom for owners of classic GM vehicles. The electrical wiring for the rear brake lights is routed directly through the turn signal switch. When the switch is in its neutral position, it completes the circuit for the brake lights. A failure inside the switch can interrupt this circuit, causing one or both brake lights to stop working even though the bulbs are good.
Are there any recalls for the GMC Sprint turn signal switch?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls or Technical Service Bulletins (TSBs) for the turn signal switch on the 1971-1977 GMC Sprint. All known failures are due to the normal wear and aging of the 50-year-old component.
How do I make sure I order the right part?
The most important factor is identifying if your truck has a standard column or a tilt steering column, as the switches are different. You must order the switch that matches your column type. If you are unsure, check if your steering column has a lever on the side that allows you to adjust its angle up and down.
Technical Specifications
The critical specification is whether the switch is for a standard (non-tilt) or a tilt steering column. The wiring harness and connector are integrated into the switch assembly.
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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.