1989-1993 Dodge D350 Wiper Motor: Diagnosis and Replacement
Get your first-generation Ram's wipers working reliably again by diagnosing common failure points.
- A common failure is the internal park switch, causing wipers to stop mid-windshield; this requires replacing the entire motor.
- Before replacing the motor, always check the fuse, listen for motor operation, and inspect the wiper linkage bushings for breakage.
- Poor grounding is a frequent issue; clean the motor's mounting points on the firewall or run a dedicated ground wire before buying a new part.
- Replacement is a straightforward DIY job that requires removing the wiper arms and cowl panel for access.
Is Your D350's Wiper Motor Failing?
On these classic first-gen Dodge trucks, wiper system problems are common due to age. Failures can be caused by the motor itself, a bad switch, corroded wiring, or even worn-out plastic bushings in the linkage. Before you replace the motor, it's important to know the specific signs of motor failure.
Common Symptoms of a Bad Wiper Motor
- Wipers Don't Move at All: If you turn on the wipers and hear nothing from the base of the windshield, the motor may be completely dead. This could also be a blown fuse or a bad ground connection. Always check the fuse first.
- Wipers Won't Park Correctly: A very common issue is when the wipers stop in the middle of the windshield when you turn them off. This is almost always caused by a failed park switch inside the motor assembly. The park switch cannot be replaced separately, so the entire motor must be changed.
- Slow or Intermittent Operation: Wipers that move very slowly, even on the high setting, or that work randomly, point to a weak, dying motor or a poor electrical connection. Sometimes, corrosion inside the motor from water intrusion is the cause.
- Only One Speed Works: If you've lost your low or intermittent speeds but the high-speed setting still works, this often points to a failure within the motor's internal circuitry or the separate intermittent wiper module found under the dash.
- Motor Runs But Wipers Don't Move: If you can hear the motor humming or running under the cowl but the arms don't move, the problem is likely not the motor. Instead, the plastic bushings in the wiper linkage have probably broken. This is a common and inexpensive fix.
Pro Tip: Check Your Grounds
These first-gen Dodge trucks are known for having grounding issues. The wiper motor often grounds itself to the firewall through its mounting bolts. Before replacing the motor, remove it, clean the mounting surfaces on the motor and the firewall with a wire brush, and ensure the bolts are tight. Sometimes, running a new, separate ground wire from the motor casing to a clean spot on the firewall can solve intermittent problems.
Choosing a New Aftermarket Wiper Motor
For a truck of this age, new OEM parts are generally not available. The choice is between new aftermarket motors, remanufactured motors, or a used OEM part from a junkyard. Given the simplicity of the part, a new aftermarket motor is a reliable and cost-effective choice.
- Cardone: Cardone is a well-known brand that offers both new and remanufactured wiper motors. Their remanufactured units are rebuilt to meet or exceed original specifications. While generally reliable, some user reviews for other vehicles mention receiving a defective unit initially, though replacements resolved the issue. Their new parts avoid the need for a core return.
- Replacement: This is a budget-friendly option. These are new units designed to be a direct-fit replacement for the original motor. For a vehicle like the D350, where the technology is not complex, a "Replacement" branded motor is often a perfectly adequate solution to restore function.
OEM vs. Aftermarket Quality
For the 1989-1993 D350, a new aftermarket motor is a solid choice. The original motors are over 30 years old, and even a used OEM part carries risks. A new aftermarket unit from a reputable brand like Cardone or a direct-fit "Replacement" part will provide reliable performance and often comes with a warranty. The key is ensuring the electrical connector matches your truck's harness.
Cost of Replacing a D350 Wiper Motor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Cardone, Replacement) | $60 - $172 |
| Remanufactured (Cardone) | $70 - $100 + Core Charge |
| Shop Labor | $110 - $165 |
Prices are estimates and can vary based on supplier and location.
Frequently Asked Questions (FAQ)
Are there any recalls for the 1989-1993 Dodge D350 wiper motor?
No, there are no specific recalls or Technical Service Bulletins (TSBs) from the NHTSA for the wiper motor on the 1989-1993 Dodge D350. Failures are typically due to the age and wear of the components. Later model Dodge Rams had recalls, but these do not apply to the first-generation trucks.
Is replacing the wiper motor a DIY job?
Yes, this is a very manageable job for a DIY mechanic. Access requires removing the wiper arms and the plastic cowl panel. The motor itself is then unbolted from the firewall. The most common difficulty is removing old, potentially seized wiper arms without a special puller tool. Applying penetrating oil can help.
What tools do I need to replace the wiper motor?
You will need basic hand tools, including a socket set (likely 10mm, 11mm, or 7/16"), a screwdriver, and possibly a trim tool to remove the cowl. It's also a good idea to have painter's tape to mark the original position of the wiper blades on the windshield before removal.
My intermittent wipers don't work, but high and low speed do. Is it the motor?
It could be, but on these trucks, the intermittent function is often controlled by a separate delay module located under the dashboard, near the ashtray area. Forum users report that this module or its connector can fail, causing the loss of intermittent wipe functions while other speeds work fine. This should be investigated before replacing the motor for this specific symptom.
Technical Specifications
OEM Part Numbers: 4389132
The replacement motor is a 4-pin design. It is crucial to visually inspect your original motor's electrical connector to ensure it matches the new part.
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.
- Dodge D350: