Ignition Contact Set Guide for the 1937-1938 GMC T14A
Keep your classic GMC T14A running smoothly by understanding this critical ignition part.
- The ignition contact set (points) is a normal wear-and-tear part that requires periodic replacement.
- Always replace the ignition condenser at the same time as the points to ensure a long service life for the new parts.
- Setting the correct point gap with a feeler gauge is critical for proper engine starting and performance.
- Symptoms like hard starting, rough running, and stalling are strong indicators that your points may be failing.
Understanding the Ignition Contact Set in Your Vintage GMC
The ignition contact set is a key maintenance part in your 1937-1938 GMC T14A's ignition system. These trucks rely on this simple mechanical switch to time the spark that powers the engine. The set consists of two contacts that are pushed open by a spinning cam inside the distributor and closed by a spring. Over many miles, the small rubbing block that rides on the cam wears down, and the electrical contacts can burn or pit. This wear and tear is normal and means the points need to be adjusted or replaced periodically to keep the engine in good running order.
Symptoms of a Failing Ignition Contact Set
When the ignition points in your T14A begin to fail, you will notice a clear drop in engine performance. The symptoms often start small but can worsen until the truck won't run at all. Be aware of these common signs:
- Hard Starting or No Start: This is one of the most common signs of bad points. The engine may turn over but fail to fire up because the points aren't creating a consistent spark.
- Engine Misfires and Rough Running: Worn or dirty points can cause an inconsistent spark, leading to a rough or shaky idle. You might also feel the engine stutter or hesitate as you accelerate.
- Stalling: The engine may stall, especially at low speeds or when coming to a stop. This happens when the weak spark cuts out completely at lower RPMs.
- Loss of Power: A truck with failing points can feel sluggish and weak. The engine struggles to respond when you press the accelerator because the spark isn't strong enough to burn the fuel efficiently.
Choosing the Right Aftermarket Ignition Contact Set
For a vintage vehicle like the T14A, new Original Equipment Manufacturer (OEM) parts are no longer produced. Your only option is new aftermarket parts. Fortunately, the aftermarket has served these vehicles for many decades.
Brand Focus: Standard Ignition
Standard Motor Products (SMP) is a long-standing brand that has made ignition components for generations. Their "Blue Streak" line is often considered a premium quality option by mechanics. For a part as critical as ignition points, choosing a reputable brand known for quality is important for reliability. Cheaper, lower-quality points can wear out quickly or fit poorly, making them difficult to adjust.
Pro Tip: Replace the Condenser at the Same Time
It is a strong recommendation among experienced mechanics to always replace the ignition condenser when you replace the points. The condenser absorbs voltage to prevent the points from arcing and burning out. A failing condenser will cause a new set of points to fail very quickly. Many aftermarket contact sets are sold as a kit that includes a new condenser.
Cost for a New Ignition Contact Set (1937-1938 GMC T14A)
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Set | $26.77 - $27.65 |
| Shop Labor | $100 - $150 |
Cost estimates are for parts and labor only and do not include taxes, shop fees, or diagnostics. Labor costs are based on an estimated 1 hour of work at a typical independent shop rate.
Frequently Asked Questions (FAQ)
What are ignition "points"?
"Points" is the common name for the ignition contact set. They are a mechanical switch inside the distributor that triggers the ignition coil to create a spark. This system was used before cars had electronic ignition.
How often should I replace the ignition contact set?
Ignition points are a routine maintenance item. They typically require adjustment or replacement every 6,000 to 12,000 miles, or if you notice symptoms of failure. The rubbing block wears down over time, which closes the gap and changes the ignition timing.
What is the "point gap" and why is it important?
The point gap is the maximum distance the contacts open. This gap is set with a feeler gauge during installation and is critical for performance. If the gap is too small, the coil can overheat; if it's too large, the spark will be weak.
Can I upgrade to electronic ignition?
Yes, many owners of classic vehicles choose to replace the points and condenser system with a modern electronic ignition conversion kit. These kits eliminate the need for regular point adjustments and can provide a more consistent spark. However, a properly maintained original points system is very reliable.
Technical Specifications
OEM Part Numbers: 1855720 1944375 1882965 D-100H
For 6-Cylinder engines with Delco-Remy distributor. Typically includes points, condenser, and cam lubricant.
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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.