1966 GMC K1000 Pickup Ignition Switch Replacement and Diagnosis
If your classic GMC truck is having trouble starting or staying on, the ignition switch could be the problem.
- Symptoms of a bad ignition switch include stalling, no-start conditions, and flickering dash lights.
- Replacement is a DIY-friendly job that takes less than an hour for most owners.
- You will likely reuse your original lock cylinder and keys with the new aftermarket switch.
- Quality aftermarket brands like Standard Ignition and Rostra are reliable choices for this part.
Is Your Ignition Switch Failing?
An ignition switch in a classic truck like the '66 K1000 is a mechanical part with electrical contacts that wears out over time. Symptoms often start small and get worse. Recognizing them early can save you from being stranded.
Common Failure Symptoms
- No-Start or Intermittent Start: You turn the key and get nothing, or it only starts sometimes. You might hear a click, or just silence.
- Stalling: The engine shuts off while you're driving, especially when hitting a bump. This happens when the switch's internal contacts momentarily lose connection, cutting power to the ignition system. This is a serious safety issue.
- Accessories Not Working: Your radio, wipers, or dashboard lights flicker or don't turn on when the key is in the 'On' or 'Accessory' position.
- Key Hard to Turn: The key feels stiff or gets stuck in the ignition. This can be a problem with the lock cylinder or the switch itself binding up.
- Engine Won't Shut Off: You turn the key to the 'Off' position, but the engine keeps running. This indicates a short or failed contacts inside the switch.
Choosing a New Aftermarket Ignition Switch
For a 1966 vehicle, finding a New Old Stock (NOS) OEM part is nearly impossible and often unnecessary. Today's aftermarket parts are the go-to solution and are widely available. For the K1000, the ignition switch is a relatively simple component, and quality aftermarket brands provide reliable, direct-fit replacements.
The ignition switch for this truck is typically sold as the electrical switch only, without the lock cylinder and keys. You can usually transfer your original lock cylinder into the new switch, keeping your original keys.
Available Brands:
- Standard Ignition (Standard Motor Products): Often considered a top-tier aftermarket brand, Standard Ignition parts are known for good quality and fit. They are a popular choice for restoration and repair projects on classic GM trucks.
- Rostra Powertrain: Rostra is another reputable manufacturer of automotive electronics. They produce a wide range of switches and sensors that meet or exceed original specifications, using materials like copper alloy conductors for good performance.
Pro Tip: While replacing the switch, it's a good time to inspect the wiring connector. Decades of heat and use can make the plastic brittle and the terminals corroded. If it looks melted or damaged, replace it to ensure a solid connection and prevent future problems.
🎬 Learn how to troubleshoot and inspect your classic truck's ignition wiring.Cost of a New Ignition Switch for 1966 GMC K1000 Pickup
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Switch Only) | $40 - $52 |
| Shop Labor | $90 - $180 |
Note: Costs are estimates and can vary based on your location and the specific repair shop. The ignition switch for this vehicle is often shared with other GM trucks of the era, like the Chevrolet C10.
Frequently Asked Questions (FAQ)
Can I replace the ignition switch myself?
Yes, this is a very DIY-friendly job for someone with basic tools and mechanical skills. The process involves disconnecting the battery, removing the dash bezel around the switch, unscrewing the switch, unplugging the electrical connector, and then reversing the steps. You may need a paperclip to release the lock cylinder from the old switch.
🎬 See how to use a paperclip to remove the lock cylinder.Do I need to replace my keys when I replace the switch?
No. Aftermarket ignition switches for this truck typically do not include the lock cylinder. You will transfer your existing lock cylinder into the new switch, allowing you to continue using your original keys.
Is there a recall on the ignition switch for my 1966 GMC truck?
No. While General Motors had major recalls for ignition switches in the 2000s, those recalls affected much newer vehicles (2003-2007 models) and do not apply to the 1966 K1000. Any issues with your truck's switch are due to age and wear.
How do I know it's the switch and not the battery or starter?
If the truck won't start, first check that the battery is charged and the terminals are clean. If the dashboard lights and headlights work brightly but the engine doesn't crank, the problem could be the starter or the ignition switch. If you experience stalling while driving or flickering accessories, the ignition switch is a more likely culprit.
Helpful Videos
Technical Specifications
OEM Part Numbers: 1116626 1116592 1116625 1116650 1116610 1116635 12339180 12339181
The ignition switch is the electrical component only and does not include the lock cylinder or keys. It mounts to the back of the dash and connects via a multi-pin plug.
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.