1966-1974 GMC K15/K1500 Pickup Ignition Switch Guide
Everything you need to know about choosing the right new aftermarket ignition switch for your classic GMC truck.
- A failing ignition switch can cause critical issues like stalling and no-start conditions.
- Aftermarket brands like Standard Ignition and Rostra offer reliable, quality replacements.
- You can often reuse your original lock cylinder and keys if the new switch is sold separately.
- This is a feasible DIY repair for owners with basic tools, and no major recalls affect this specific truck generation.
Is Your Ignition Switch Failing?
An ignition switch in a classic truck like the 1966-1974 GMC K15/K1500 sees a lot of use and can wear out over time. The internal electrical contacts can degrade, leading to a range of problems. If you're experiencing electrical gremlins, the ignition switch is a common culprit.
Common Failure Symptoms:
🎬 Watch this video to identify signs of a failing switch.- Truck Won't Start: You turn the key, and nothing happens, or you only hear a click. If the battery and starter are good, the switch is a likely suspect.
- Intermittent Stalling: The engine cuts out while you're driving. This is a serious safety issue that can be caused by a faulty switch losing connection.
- Key Issues: The key feels loose, gets stuck, or won't turn properly in the ignition.
- Accessory Problems: Your radio, lights, or other electrical components don't work or behave erratically, flickering on and off.
- Visible Smoke: Smoke coming from the steering column or dash area when trying to start the truck is a critical sign of a short circuit in the switch.
Safety First: Disconnect the Battery
Before starting any work on your truck's electrical system, always disconnect the negative battery terminal to prevent electrical shocks or short circuits.
Choosing the Right Aftermarket Ignition Switch
For a vintage truck like the '66-'74 K15/K1500, new Original Equipment Manufacturer (OEM) parts are generally not available. The good news is that the aftermarket offers a wide selection of replacement switches. Aftermarket parts can be as good as or even exceed original quality, especially when you choose a reputable brand.
Brand Tiers for Your GMC
When shopping for a new ignition switch, you'll find several brands. Here’s a breakdown of what to expect:
- Standard Ignition (Standard Motor Products): A well-regarded brand in the aftermarket with a long history. They often use quality materials like copper alloy conductors for good electrical performance. Reviews suggest their parts are generally reliable and fit well, though occasional manufacturing defects like bad threads have been noted.
- Rostra Powertrain: Rostra produces a wide range of electronic components for both OEM and aftermarket applications. They emphasize testing and using quality materials to meet or exceed original specifications. They are a solid choice for a reliable replacement part.
- Replacement: This is often a budget-friendly brand. These parts are designed to be direct-fit replacements and can offer significant savings. While they can be a good value, quality can sometimes be inconsistent. It's best for owners who are comfortable with the possibility of a shorter lifespan compared to premium brands.
Pro Tip: Many ignition switches for this era of GM trucks were used across different models. However, always verify the part fits your specific year and model, paying attention to details like whether your truck has a tilt or non-tilt steering column.
Cost of a New Aftermarket Ignition Switch
The cost for a new aftermarket ignition switch for your 1966-1974 GMC K15/K1500 is very reasonable. The part itself is affordable, and if you have basic tools, you can likely replace it yourself.
| Part Type | Price Range |
|---|---|
| New Aftermarket Ignition Switch | $20.77 - $55.28 |
| Shop Labor for Installation | $100 - $200 |
Frequently Asked Questions
Do I need to replace the lock cylinder with the switch?
Not always. Many aftermarket switches are sold without the lock cylinder, allowing you to reuse your original keys and cylinder. This is often a more straightforward installation. However, if your key is sticking or hard to turn, it's a good idea to replace the lock cylinder at the same time. Some kits include both the switch and a new lock cylinder 🎬 Learn how to install a new switch and key cylinder. with keys.
Is replacing the ignition switch a difficult job?
For most mechanically inclined owners, this is a manageable DIY project. 🎬 See how to troubleshoot and replace your classic truck's switch. The difficulty is low to moderate. It typically involves removing some dash panels and/or steering column covers to access the switch. You'll need basic hand tools, and for some years, a special tool to release the lock cylinder. The entire job can usually be done in about an hour or two.
Are there any recalls for the ignition switch on my truck?
There have been major, well-publicized GM ignition switch recalls, but they affect much newer vehicles (mostly from the 2000s) and do not apply to the 1966-1974 GMC K15/K1500 series. There are no specific NHTSA recalls or Technical Service Bulletins (TSBs) found for ignition switches on this classic truck generation.
What is the difference between the ignition switch and the lock cylinder?
The lock cylinder is the mechanical part you put your key into. The ignition switch is the electrical component that the lock cylinder turns. The switch is what actually sends power to the rest of the truck. They are two separate but connected parts.
Helpful Videos
Technical Specifications
OEM Part Numbers: 1116683 1116695 1116704 1116709 1116711 1116712 1116592 1116625 1116650 12339180
The ignition switch for the 1966-1974 GMC K15/K1500 is typically a dash-mounted or column-mounted electrical switch. It features multiple terminals to control different circuits (e.g., start, run, accessory). The design varies slightly across the year range, particularly with the introduction of steering column-mounted switches in later years. It's crucial to match the switch to your vehicle's specific year and whether it has a tilt or non-tilt steering column.
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.