1970-1976 GMC Jimmy Ignition Contact Set: A Mechanic's Guide
Keep your classic Jimmy running strong by understanding this critical ignition part.
- The ignition contact set (points) is a normal wear item on a 1970-1976 GMC Jimmy and a common cause of starting and running issues.
- When replacing the points, always replace the condenser at the same time for reliability.
- Using a dwell meter to set the points to the correct angle (around 30 degrees for a V8) is more accurate than using a feeler gauge alone.
- Both Standard Ignition and Accel are reputable aftermarket brands for this part.
Is Your Classic Jimmy Having Ignition Troubles?
If your 1970-1976 GMC Jimmy is suddenly hard to start, running rough, or stalling, a worn-out ignition contact set could be the problem. These older trucks use a mechanical ignition system with points and a condenser, which are normal wear-and-tear items that require periodic replacement. Unlike modern electronic ignitions, this system needs regular attention to keep your engine performing its best.
Critical Failure Symptoms
A failing ignition contact set can leave you stranded. The most common signs include the engine turning over but not starting, rough idling, misfiring, and a noticeable loss of power when you accelerate. In some cases, the vehicle may not start at all.
Choosing the Right Aftermarket Ignition Contact Set
For a vehicle of this age, new Original Equipment Manufacturer (OEM) parts are typically unavailable. The market is well-served by aftermarket brands that provide quality replacements. Your choice will come down to trusted names that have been making ignition components for decades.
- Standard Ignition (Standard Motor Products): Often considered a top-tier aftermarket brand, Standard Motor Products (SMP) has a long history of producing reliable electrical parts that meet or exceed original specifications. Many professional mechanics trust SMP for its quality and durability. For a stock restoration or reliable daily driving, this is an excellent choice.
- Accel: Accel is a well-known performance brand. While they are famous for high-output coils and performance distributors, their standard replacement points are also a popular option. Some users have reported mixed results with certain Accel products over the years, but for a basic part like an ignition contact set, they are generally considered a solid choice, especially if you are looking for parts designed with performance in mind.
Pro Tip: When you replace the ignition contact set, it is highly recommended to also replace the condenser. They are typically sold together in a kit. The condenser prevents the points from arcing and burning out prematurely. Also, check your distributor cap and rotor for wear, as these are also key parts of your ignition tune-up.
New Aftermarket Ignition Contact Set Cost for 1970-1976 GMC Jimmy
| Part Type | Our Price Range |
|---|---|
| New Aftermarket Ignition Contact Set | $21.11 - $55.54 |
Frequently Asked Questions (FAQ)
What are ignition "points"?
"Points" is the common name for the ignition contact set. They are a small mechanical switch inside the distributor that opens and closes to trigger the spark from the ignition coil. This system was used in most vehicles before the widespread adoption of electronic ignition in the mid-to-late 1970s.
How often do I need to replace the ignition contact set?
Ignition points are a maintenance item. They typically need to be checked and adjusted or replaced every 12,000 to 20,000 miles, or as part of an annual tune-up. The rubbing block on the points wears down over time, which changes the ignition timing and dwell angle.
What is "dwell angle" and why is it important?
Dwell angle is the amount of time, measured in degrees of distributor rotation, that the points are closed. This allows the ignition coil to become fully saturated with energy. Setting the correct dwell angle is more accurate than just setting the point gap with a feeler gauge, especially on worn distributors. For GM V8 engines of this era, the dwell is typically set to 30 degrees.
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 ideally, a dwell meter to set them correctly. The job involves removing the distributor cap and rotor, unscrewing the old points and condenser, installing the new ones, and adjusting the gap. It is considered a beginner-to-intermediate level task.
Are there any recalls for the ignition system on my 1970-1976 GMC Jimmy?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls specifically for the ignition contact set on this vehicle. The major GM ignition switch recalls from the 2010s were for much newer vehicles with a completely different design.
Technical Specifications
This is a mechanical contact set for a distributor-based ignition system. It works in conjunction with an ignition condenser. Proper adjustment is set via point gap or, more accurately, by dwell angle.
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.