Dodge W100 Ignition Switch Guide: 1984-1989 Problems and Replacement
If your W100 cranks but won't stay running or has strange electrical issues, your ignition switch is a likely suspect.
- A symptom where the truck starts but dies when the key returns to 'run' strongly points to a failed ignition switch or ballast resistor.
- Sudden stalling while driving is a critical safety issue and means the switch should be replaced immediately.
- This is a common DIY repair that takes 1-2 hours; the switch is on the steering column, separate from the key cylinder.
- No recalls have been issued for this part, but failure is a well-documented problem for this generation of Dodge truck.
Is Your W100's Ignition Switch Failing?
The ignition switch is a common failure point on first-generation Dodge trucks. Over decades of use, the electrical contacts inside wear out, causing a range of frustrating problems. Recognizing the symptoms early can prevent you from getting stranded.
Common Failure Symptoms
- Starts, Then Immediately Dies: This is a classic sign. The engine fires up while you hold the key in the 'Start' position but shuts off as soon as you let go and it returns to 'Run'. This means the 'Run' circuit inside the switch has failed.
- No Crank, No Start: You turn the key and nothing happens at all. The dashboard might light up, but the starter motor is completely silent because the switch isn't sending it the signal to crank.
- Stalling While Driving: The engine can suddenly shut off while you are on the road, especially after hitting a bump. This is a serious safety issue caused by a momentary loss of connection inside the switch, cutting power to the ignition system.
- Flickering Lights and Gauges: Your dashboard lights, radio, or heater fan may cut in and out randomly. Wiggling the key in the ignition might cause these accessories to turn on or off, which points directly to a worn switch.
Safety First: Stalling Risk
An ignition switch that causes the engine to stall while driving is a critical safety hazard. You will lose power steering and power brakes, making the truck very difficult to control. This issue should be addressed immediately.
Choosing a New Aftermarket Ignition Switch
For a truck from the 1980s, finding a new original equipment (OEM) part from Mopar is nearly impossible. The most practical and available option is a new aftermarket switch. Standard Ignition (also known as Standard Motor Products or SMP) is one of the most common brands you will find.
Aftermarket quality for these parts can be mixed. Some mechanics and owners report success with Standard Ignition parts, viewing them as a reliable replacement. However, others have reported issues with parts being faulty out of the box or failing prematurely. Given the low cost and relative ease of replacement, using a quality aftermarket part is still the standard repair for these trucks. Just be sure to test its function thoroughly after installation.
Ignition Switch Replacement Cost for 1984-1989 Dodge W100
The cost to replace the ignition switch is reasonable, especially if you can do the work yourself. The job requires basic hand tools and takes about one to two hours.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Switch | $46.45 - $96.99 |
| Shop Labor | $120 - $250 |
| Total Professional Repair | $166.45 - $346.99 |
Pro Tip: The ignition switch is located on top of the steering column, under the dash. It is a separate part from the lock cylinder where you insert your key. The replacement involves removing the lower dash panels to gain access.
Frequently Asked Questions (FAQ)
Can I replace the ignition switch myself?
Yes, this is a DIY-friendly job for most home mechanics. It involves removing the plastic covers around the steering column, unplugging the old switch, and carefully installing the new one, making sure the actuator rod from the key cylinder is properly aligned. There are many video guides available for this generation of Dodge truck that show the process step-by-step.
My key is stuck or hard to turn. Is that the ignition switch?
It could be, but difficulty turning the key is more often a problem with the mechanical ignition lock cylinder, which is the part your key goes into. The ignition switch is the electrical component that the lock cylinder controls. Sometimes both parts wear out and are replaced together.
I replaced the switch, but my truck still starts and then dies. What else could it be?
For these Dodge trucks, the other prime suspect for a 'start and die' issue is the ballast resistor. This is a small ceramic block in the ignition system that regulates voltage to the coil. It's a common failure item and is inexpensive to replace. Always check or replace the ballast resistor when diagnosing this specific symptom.
Are there any recalls for the W100 ignition switch?
No. A search of the National Highway Traffic Safety Administration (NHTSA) database shows no safety recalls for the ignition switch on the 1984-1989 Dodge W100.
My truck has no power at all. Could it be something other than the ignition switch?
Yes. These trucks use fusible links, which are special wires that act like a main fuse. If a fusible link blows, you can lose all power to the cab, making it seem like the ignition switch is dead. Before replacing the switch, check for power at the fuse box and inspect the fusible links near the starter relay on the driver's side fender.
Technical Specifications
Located on the steering column, activated by a rod connected to the ignition lock cylinder. Controls Accessory, Run, and Start circuits.
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.
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