Ignition Coil Guide for 1949-1953 Studebaker 2R17 Trucks
Solve common running problems and keep your classic Studebaker 2R17 reliable with the right ignition coil.
- You must verify if your truck has a 6-volt or 12-volt electrical system before ordering a coil.
- A failing coil causes no-starts, rough running, stalling when hot, and backfiring.
- Modern aftermarket brands like Standard Ignition and NGK are reliable replacements for unavailable OEM parts.
- It is highly recommended to also replace the ignition points and condenser for a complete and reliable repair.
Is Your Studebaker's Ignition Coil Failing?
An ignition coil is a wear item. Decades of heat cycles and electrical stress can cause the internal windings to break down. On a vintage truck like the Studebaker 2R17, which lacks modern computer diagnostics, identifying a bad coil relies on observing the symptoms. A failing coil can cause problems that seem complex but are often a straightforward fix.
The Most Important Check: 6-Volt or 12-Volt?
Before buying any ignition part, you MUST know if your truck has its original 6-volt electrical system or if it has been converted to a more modern 12-volt system. Installing a 6-volt coil on a 12-volt system will cause it to overheat and fail quickly. Conversely, a 12-volt coil on a 6-volt system will produce a very weak spark. Many of these trucks have been converted over the years.
Pro Tip: Check your battery. A 6-volt battery has 3 filler caps on top, while a 12-volt battery has 6. This is the easiest way to confirm your system's voltage.
Common Symptoms of a Bad Ignition Coil
If your coil is on its way out, you'll likely notice one or more of these classic signs:
- No Start or Hard Starting: The engine cranks over but refuses to fire up, or takes much longer than usual to start. This happens when the coil isn't producing enough voltage for a spark.
- Engine Misfires and Sputtering: The engine runs roughly, shakes, or feels like it's stumbling, especially when you try to accelerate. This is caused by an inconsistent or weak spark.
- Stalling, Especially When Hot: A classic symptom of coil failure is when the truck runs fine when cold but suddenly stalls after 20-30 minutes of driving. As the coil heats up, a break in the internal wiring can expand and open the circuit, killing the spark.
- Backfiring: Loud popping from the exhaust can occur when unburned fuel from a misfire ignites in the hot exhaust system.
- Noticeable Loss of Power: Your truck may feel sluggish and weak, struggling to get up to speed or climb hills.
Choosing the Right Aftermarket Ignition Coil
Original factory coils for a 1949-1953 Studebaker are no longer manufactured. While you might find a "New Old Stock" (NOS) part, its reliability is questionable after sitting on a shelf for over 70 years. Modern aftermarket coils are the standard, reliable choice for keeping these classic trucks on the road. The key is choosing a quality part that matches your truck's electrical system.
| Brand Tier | Brands | Our Price | Notes |
|---|---|---|---|
| Better | Standard Ignition, NGK | $32 - $39 | These are well-regarded brands known for producing reliable ignition components that meet or exceed original specifications. Standard's "Blue Streak" line is their premium offering. Both are trusted choices for classic vehicle restorations and maintenance. |
| Good | Spectra | $28 - $32 | Spectra offers a budget-friendly option. While many users have success with these parts, some forum discussions report a higher rate of premature failure compared to premium brands. It can be a viable choice, but may not have the same long-term durability as higher-tier options. |
Don't Forget the Ballast Resistor: Many 6-volt systems of this era use an external ballast resistor (a small ceramic block) to protect the ignition points. If your truck has one, you must use a coil designed for an external resistor. If you use a coil with an *internal* resistor, you must bypass the external one. Using both will result in a very weak spark.
Frequently Asked Questions (FAQ)
Is replacing the ignition coil a difficult job?
No, this is a very easy job suitable for any DIY mechanic. The coil is mounted externally on the engine or firewall with a simple bracket. It involves disconnecting the battery, removing two or three small wires, and unbolting the bracket. The entire job typically takes less than 30 minutes with basic hand tools.
Should I replace anything else at the same time?
Yes. It is highly recommended to replace the ignition points and condenser when you install a new coil. These three parts work together and are all considered regular tune-up items. Replacing them all at once ensures your entire primary ignition system is fresh and reliable, preventing the old parts from damaging your new coil.
How do I test my old ignition coil?
You can perform a basic test with a multimeter. For a typical 6-volt coil, the primary resistance (between the two small terminals) should be around 1.0 to 2.5 ohms. The secondary resistance (between the high-voltage tower and a primary terminal) should be between 5,000 and 10,000 ohms. A reading of zero indicates a short, while an infinite reading (OL) means a break. A simpler test is to check for spark: hold the main coil wire about 1/4 inch from the engine block and have a friend crank the engine. A strong, bright blue spark indicates a good coil, while a weak, yellow or orange spark suggests the coil is failing.
Are there any recalls or service bulletins for the 2R17 ignition coil?
No, there are no active recalls or technical service bulletins (TSBs) from the NHTSA for the ignition system on these vintage trucks. Any service bulletins were issued decades ago and pertained to routine maintenance procedures of that time.
Technical Specifications
Voltage: 6V (unless converted to 12V). Primary Resistance (6V): Approx. 1.0-2.5 Ohms. Secondary Resistance (6V): Approx. 5k-10k Ohms. Note: Some systems require a coil for an external ballast resistor.
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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.