Ignition Contact Set Replacement Guide for the 1947 GMC EC282
Keep your classic GMC's engine firing reliably with the right ignition contact set.
- The ignition contact set (points) is a routine maintenance part that must be replaced periodically, typically every 10,000-12,000 miles.
- Symptoms of failure include no-start, rough running, and stalling.
- Aftermarket parts are the only option; Standard Ignition is a reputable brand for these components.
- Replacement is a straightforward DIY task for those with basic mechanical skills and a feeler gauge.
Understanding the Ignition System in Your 1947 GMC
Your 1947 GMC EC282 uses a simple and robust mechanical ignition system. Unlike modern cars with computers, your truck relies on this set of ignition points and a matching condenser to create the spark for the engine. The points are a wear-and-tear item, just like brake pads or tires. The metal contacts slowly burn away and the rubbing block that rides on the distributor cam wears down. Because of this, they require regular inspection and replacement to keep your truck starting and running properly.
Symptoms of a Failing Ignition Contact Set
When the points begin to fail, your truck will give you clear signs. Ignoring them can leave you stranded. Common symptoms include:
- Hard Starting or No Start: This is the most common symptom. Worn or corroded points can't make a clean electrical connection, resulting in a weak or non-existent spark.
- Rough Engine Operation: If the engine runs rough, misfires, or shakes, it can be due to inconsistent spark from failing points. This happens when the points don't open and close at the precise moment needed.
- Stalling: The engine may stall at idle or when you come to a stop. This can happen because the weak spark isn't enough to keep the engine running at low RPMs.
- Loss of Power: You might notice the truck feels sluggish or hesitates during acceleration. This is a sign that the ignition timing is off due to worn points, resulting in wasted fuel and less power.
Choosing the Right Aftermarket Part
Original Delco-Remy ignition parts for a 1947 truck have not been made in many decades. This means your only choice is an aftermarket part. For a critical component like this, quality matters.
Pro Tip: Always replace the condenser at the same time as the ignition contact set. A failing condenser can quickly destroy a new set of points. They are inexpensive and usually come with the points set.
Brand Spotlight: Standard Ignition
Standard Motor Products (SMP) is a well-known American company that has been making ignition parts for a very long time. For classic US-built trucks like your GMC, their parts are considered a reliable, quality choice. While some enthusiasts note that the quality of all modern points isn't what it was 50 years ago, Standard remains a go-to brand for keeping these vintage systems running correctly.
| Part Type | Cost Range |
|---|---|
| New Aftermarket (Standard Ignition) | $21.44 |
| Shop Labor | $100 - $150 |
| Total Estimated Cost | $121 - $172 |
Known Issues & Recalls
There are no official recalls or Technical Service Bulletins (TSBs) from the NHTSA for the ignition system on a 1947 GMC EC282. This is normal for a vehicle of this age. The primary 'issue' is the routine wear and tear of the points, which is addressed by regular maintenance.
Frequently Asked Questions (FAQ)
How often should I replace my ignition points?
For a regularly driven truck, it's a good practice to inspect the points during every tune-up and plan on replacing them every 10,000 to 12,000 miles. If the truck sits for long periods, the points can corrode, requiring replacement even with low mileage.
What is a 'point gap' and why is it important?
The 'point gap' is the maximum distance the points open. This gap is tiny and must be set precisely with a tool called a feeler gauge. An incorrect gap will alter the ignition timing and can cause poor running, misfiring, or prevent the engine from starting at all.
Can I replace the ignition contact set myself?
Yes, this is a very common DIY job for owners of classic vehicles. It requires basic hand tools, a feeler gauge, and careful attention to detail. The job involves removing the distributor cap and rotor, replacing the points and condenser, and setting the gap. Many videos online demonstrate the general process for vintage GM 6-cylinder engines.
Should I convert to an electronic ignition?
Converting to an electronic ignition is a popular upgrade that eliminates the need for points and condensers, offering improved reliability and less maintenance. However, many owners prefer to keep the original system for authenticity. A properly maintained points system is very reliable. If your points fail on the road, they can often be cleaned and re-gapped to get you home, whereas a failed electronic module requires a complete replacement part.
Technical Specifications
OEM Part Numbers: 1855720 1944375
For 6-Cylinder Engines with a mechanical point-style distributor.
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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.