Dodge D100 Wiper Motor Guide for 1975-1980 Models
Having trouble with your classic D100's wipers? Here’s what you need to know before replacing the motor.
- Before replacing the motor, check the plastic wiper linkage bushings under the cowl; they are a common, cheaper failure point.
- If wipers don't return to their resting position, the motor's internal park switch has failed and the motor needs replacement.
- New OEM parts are unavailable; your primary choice is a new or remanufactured motor from an aftermarket brand like Cardone.
- Replacement is a DIY-friendly job that typically takes under two hours with basic tools.
Is Your Wiper Motor Failing? Common Symptoms
On a 1975-1980 Dodge D100, the wiper system is simple, but when the motor starts to go, the signs are hard to miss. Here’s what to look out for:
- Slow or Lazy Wipers: If your wipers struggle to move across the glass, especially on a dry or lightly wet windshield, the motor is likely getting weak.
- One Speed Only: Your truck should have multiple wiper speeds. If they only work on high or low no matter the setting, the motor's internal controls are probably failing.
- Wipers Won't Park Correctly: A very common issue on these older Dodge trucks is when you turn the wipers off and they stop in the middle of the windshield. This points to a failure in the motor's internal park circuit or switch.
- No Movement at All: If you turn the wipers on and nothing happens, the motor may have completely burned out. You might hear a faint humming or buzzing sound, which means the motor is getting power but can't move.
Check This Before You Buy!
A common problem that mimics a bad wiper motor is the failure of small plastic bushings in the wiper linkage. If you can hear the motor running but the wipers don't move or move erratically, these bushings have likely crumbled. These are inexpensive and much easier to replace than the entire motor, so it's worth checking them first by removing the cowl panel for a visual inspection.
Choosing a New Aftermarket Wiper Motor
For a vehicle as old as the 1975-1980 D100, finding a brand-new Original Equipment (OEM) wiper motor from Dodge is not a realistic option. Your choices are a new aftermarket part, a remanufactured part, or a used part from a salvage yard.
New Aftermarket (Cardone): Cardone is the primary brand offering new aftermarket wiper motors for this truck. These are built from scratch to match the original's performance. Owner reviews for Cardone parts on classic vehicles are often mixed; some find them to be a reliable, cost-effective solution, while others report issues with noise or longevity. However, for a guaranteed-new part with a warranty, this is your most direct option.
Remanufactured (Cardone): Cardone also specializes in remanufactured motors. This means they take an original motor, disassemble it, replace worn or failed components, test it, and sell it again. This can be a good option as it retains an OEM core. Quality can vary, but they often come with a lifetime warranty.
Estimated Replacement Costs
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Cardone) | $125.26 - $192.99 |
| Remanufactured (Cardone) | $90 - $150 |
| Used (Salvage Yard) | $40 - $80 |
| Shop Labor | $100 - $200 |
A Note on Installation
Replacing the wiper motor on a D100 is a manageable job for a DIYer. The motor is located under the cowl panel between the hood and windshield. The basic steps involve removing the wiper arms, taking off the cowl panel, unbolting the linkage from the old motor, disconnecting the wiring, and then unbolting the motor from the firewall. Before you put everything back together, connect the new motor to the wiring harness and briefly turn the wipers on to ensure it works.
Frequently Asked Questions (FAQ)
Is it difficult to replace the wiper motor myself?
No, it is generally considered an easy to moderate repair for someone with basic mechanical skills. You will need common hand tools like sockets and screwdrivers. The main steps are removing the wiper arms and the cowl panel to get access. The entire job can usually be done in 1-2 hours.
Are there any recalls or TSBs for the D100 wiper motor?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database and other technical resources show no specific recalls or technical service bulletins (TSBs) for the wiper motor on 1975-1980 Dodge D100 trucks. Any issues today are due to the age and wear of the original components.
Why did my wipers stop in the middle of the windshield?
This is a classic symptom of a failed 'park switch' inside the wiper motor. This switch is responsible for cutting power to the motor only when the wipers have returned to their resting position at the base of the windshield. When it fails, the motor stops the moment you turn the switch off, regardless of wiper position.
I hear the motor running, but the wipers don't move. What's wrong?
This is almost always caused by broken plastic bushings in the wiper linkage (the arms that connect the motor to the wipers). The motor is spinning, but the connection to the arms is broken. You should inspect these bushings before buying a new motor.
Technical Specifications
Typically a 2-speed motor with an internal park switch. Mounts to the firewall under the cowl panel.
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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.