Ignition Switch Guide for the 1966 GMC PB3500 Van
Everything you need to know before replacing the ignition switch on your classic 1966 GMC PB3500 Van.
- Failure symptoms often appear as electrical issues like a no-start condition, sudden stalling, or flickering dash lights.
- Replacement is a simple DIY job for most owners, typically requiring a paper clip and basic hand tools.
- Aftermarket brands like Standard Ignition are a reliable choice, with a strong reputation for quality in classic GM vehicles.
- Avoid using a heavy keychain, as the weight can cause premature wear on the ignition switch.
Is Your Van Hard to Start? Signs of a Failing Ignition Switch
The ignition switch in a classic vehicle like the 1966 GMC PB3500 Van is a mechanical part that wears out over time. Symptoms of failure are usually electrical and can sometimes be mistaken for a bad battery or starter. Look out for these common signs:
- No Crank, No Start: You turn the key and nothing happens. The dashboard lights may or may not come on, but the starter motor is silent. This can mean the switch isn't sending the signal to the starter.
- Van Stalls Suddenly: The engine cuts out while you're driving. This can be dangerous, as it also cuts power to the ignition system. Vibration or a bump in the road can cause a worn switch to lose contact.
- Starts and Immediately Dies: The engine fires up but stalls as soon as you release the key from the 'Start' to the 'On' position. This points to a failure in the switch's 'On' circuit.
- Flickering Lights and Gauges: Your dashboard lights or headlights flicker, and gauges behave erratically. This indicates an inconsistent electrical connection inside the switch.
- Key is Hard to Turn or Remove: The mechanical part of the switch or the lock cylinder can wear out, making it difficult to turn or remove the key.
A Note on Heavy Keychains
For these older GM vehicles, a heavy keychain can put extra weight on the ignition lock cylinder and the switch behind it. Over many years, this can accelerate wear and lead to premature failure. It's a good practice to keep only the ignition key on its own ring.
Choosing the Right Aftermarket Ignition Switch
For a 1966 vehicle, finding a new original equipment (OEM) part from GM is nearly impossible. The market is served by aftermarket manufacturers who produce new replacement parts. For your PB3500 Van, two common brands are Standard Ignition and Rostra.
Brand Quality Assessment
- Standard Ignition (Standard Motor Products): SMP is a well-regarded brand with a long history of making quality ignition components for American vehicles. They are often considered a top-tier aftermarket choice, known for good materials and reliable performance. For a vintage application like this, Standard is a trusted name.
- Rostra Powertrain: Rostra also produces a wide range of automotive electronics. Their parts are designed to be direct-fit replacements and are built with quality materials like copper conductors for good conductivity. While not as historically well-known for classic ignition parts as Standard, they are a viable option.
Pro Tip: Given the critical function of the ignition switch, choosing a reputable brand is important. Based on long-term reputation in the classic vehicle community, Standard Ignition is a highly recommended choice for this specific part.
Estimated Cost for Ignition Switch Replacement
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Standard, Rostra) | $40 - $52 |
| Shop Labor | $60 - $120 |
| Total Estimated Cost | $100 - $172 |
Note: Costs are estimates and can vary based on your location and the specific repair shop. OEM parts are generally not available as new.
Frequently Asked Questions (FAQ)
Is replacing the ignition switch a difficult job?
No, for this van it is a relatively simple job. The switch is located on the dashboard and is accessible from underneath. The process typically involves disconnecting the battery, removing the lock cylinder (usually with a paper clip), unscrewing the bezel nut, and unplugging the electrical connector from the back of the switch. Most DIY mechanics can do this in under an hour.
Do I need to replace my key?
Not usually. The ignition switch is the electrical component behind the dash. You can typically transfer your original lock cylinder and key to the new switch. The process involves depressing a small pin on the cylinder to release it from the old switch and inserting it into the new one.
Are there any recalls for the 1966 GMC PB3500 ignition switch?
No. There are no active recalls or Technical Service Bulletins (TSBs) from the National Highway Traffic Safety Administration (NHTSA) for the ignition switch on this specific vehicle. The major GM ignition switch recalls from the 2010s involved much newer vehicles with different designs.
Can I just bypass the ignition switch?
While technically possible for a mechanic to bypass the switch for diagnostic purposes, it is not a safe or recommended long-term solution. A faulty switch should be replaced to ensure the vehicle operates safely and reliably.
Technical Specifications
OEM Part Numbers: 26070111
Dash-mounted, key-operated electrical switch with terminals for Battery, Ignition, Accessory, and Starter.
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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.