Chrysler 300 Ignition Switch Guide: 1970-1974
Solve starting problems and electrical gremlins in your classic 1970-1974 Chrysler 300.
- A faulty ignition switch can cause dangerous stalling, a no-start condition, or intermittent electrical problems.
- For a 1970-1974 Chrysler 300, a quality aftermarket brand like Standard Ignition is the standard replacement part, as new OEM parts are unavailable.
- Replacement is a feasible DIY task for those comfortable with basic auto repair, involving access to the steering column.
- Before replacing the switch, consider also checking the ballast resistor, as it can cause similar symptoms on these vehicles.
Is a Failing Ignition Switch Causing Your Chrysler 300's Problems?
If your classic Chrysler 300 is having trouble starting, stalling unexpectedly, or showing other electrical issues, a bad ignition switch could be the cause. This component is used every time you drive, and after 50+ years, wear and tear is common. The internal electrical contacts can wear out, leading to a poor connection that can leave you stranded.
Common Symptoms of a Bad Ignition Switch
- No-Start or Hard Start: You turn the key and nothing happens, or the engine cranks but won't start. Sometimes you might have to jiggle the key to find a "sweet spot" for it to work.
- Engine Stalling: The car may start and run, but then suddenly shut off while you're driving. This is a serious safety issue, as it also causes a loss of power steering and power brakes.
- Electrical Accessories Not Working: Your radio, dashboard lights, or heater fan might not turn on, or they may flicker and work intermittently. This happens because the switch isn't providing steady power to these systems.
- Key Is Hard to Turn: If the key feels stiff, gets stuck, or won't turn smoothly in the ignition, the mechanical parts of the switch assembly may be worn out.
Choosing the Right Aftermarket Ignition Switch
For a vehicle from the 1970-1974 model years, finding a new original equipment manufacturer (OEM) part from Mopar is nearly impossible. The standard and most reliable option is a high-quality aftermarket replacement. Aftermarket parts are often the only choice for classic cars and are designed to meet or exceed the original specifications.
Standard Ignition (Standard Motor Products): This is a well-regarded brand in the aftermarket industry with a long history of producing reliable electrical components. Owners and mechanics generally trust their parts for fit and function. Their switches are built with quality materials like copper alloy conductors to ensure good electrical performance. For your Chrysler 300, a brand like Standard Ignition is a dependable choice.
Estimated Cost to Replace Ignition Switch (1970-1974 Chrysler 300)
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (e.g., Standard Ignition) | $85.04 |
| New Old Stock (NOS) OEM | $200+ (If found) |
| Used OEM (Junkyard/eBay) | $20 - $50 |
| Shop Labor | $100 - $200 |
Frequently Asked Questions (FAQ)
Can I replace the ignition switch myself?
Yes, this is a manageable job for a DIYer with basic tools. The switch is located on the steering column, so you will need to remove the steering column covers to access it. It's important to disconnect the battery before starting any electrical work. While it's a straightforward replacement, some owners find getting access to be the hardest part.
What's the difference between the ignition switch and the lock cylinder?
The lock cylinder is the mechanical part you put your key into. The ignition switch is the electrical component connected to the back of the lock cylinder. Sometimes the cylinder is fine, but the switch is bad, or vice-versa. For this vehicle, they are typically sold as separate parts.
Could a bad ballast resistor be causing similar problems?
Yes. On classic Mopars, a failing ballast resistor can cause symptoms like stalling or a no-start condition, which can be mistaken for a bad ignition switch. It's a common and inexpensive part to check and replace as part of your diagnosis.
Why do my dashboard lights flicker or not work at all?
The ignition switch's "ON" or "ACC" position powers the dashboard and interior accessories. If the internal contacts are worn, they can create a poor connection, causing lights and other electronics to flicker or fail completely.
Technical Specifications
OEM Part Numbers: 2947719 3467405
Fits 1970-1974 Chrysler 300 models with column-mounted ignition. Does not typically include the lock cylinder and key. Designed for vehicles without a tilt steering column.
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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.