FORD D8TB-17C475-AA Windshield Wiper Delay Module Imtermitent

( Manufacturer Part Number: D8TB-17C475-AA ), ( Type: Dash Panel ), ( Placement On Vehicle: Dashboard ), ( Country Of Origin: United States )

Review FORD Windshield Wiper Delay Module Imtermitent fits BRONCO F150 F250 F350 1978–1979

The **Ford D8TB-17C475-AA Windshield Wiper Delay/Intermittent Module** is a critical yet often overlooked component designed specifically for the **1978 and 1979 Ford F-Series trucks**, including the **F-150, F-250, and F-350**, as well as the **Bronco** models from those years. This module serves as the brain of the windshield wiper system, controlling both the **delayed start** and **intermittent operation** of the wipers, ensuring smooth, reliable performance in varying weather conditions. Engineered to integrate seamlessly with the **D8TB wiper motor assembly** (commonly found in these vehicles), this module features a robust, durable construction built to withstand the demands of daily use in harsh environments, from heavy rain to dusty construction sites.

At its core, the **D8TB-17C475-AA** is a **mechanical-electrical hybrid system**, combining a **timed relay mechanism** with adjustable resistance settings to fine-tune the wiper s operation. When activated, the module introduces a **pre-delay** before the wipers begin moving, allowing the driver to clear the windshield of light rain or drizzle without immediate, aggressive sweeping. This feature is particularly useful in scenarios where a quick wipe isn t necessary, conserving battery life and reducing wear on the wiper blades and motor. For intermittent operation, the module cycles the wipers at user-adjustable intervals typically ranging from a few seconds to several minutes providing consistent, even clearing without constant manual intervention.

The design of this module reflects Ford s engineering standards of the late 1970s, balancing simplicity with functionality. It is housed in a **compact, metal enclosure** with clearly labeled terminals for easy installation, ensuring compatibility with the original wiring harness of the F-Series and Bronco models. The module s **adjustable potentiometer** allows for customization of the wiper speed and delay, catering to individual driving preferences or adapting to different environmental conditions. Over time, however, exposure to moisture, vibration, or electrical fluctuations can degrade the internal components, leading to erratic wiper behavior, such as sudden bursts of speed or failure to engage at all. Replacing a faulty module with an **OEM-quality D8TB-17C475-AA** restores the wiper system to its intended performance, ensuring reliability and safety on the road.

Beyond its functional benefits, this module is also a **nostalgic piece for classic vehicle enthusiasts**, embodying the mechanical ingenuity of an era when reliability and durability were paramount. Whether restoring a **1978 Bronco for off-road adventures** or maintaining a **vintage F-250 work truck**, the **D8TB-17C475-AA** is an essential part of preserving the original driving experience. Its straightforward design and direct compatibility with aftermarket wiper motors and harnesses also make it a popular choice for customization projects, allowing owners to upgrade to modern wiper blades or motors while retaining the classic intermittent functionality. For those seeking to maintain or revive their Ford s windshield wiper system with authenticity and precision, this module is an indispensable, time-tested solution.

### **Pros and Cons of Buying a Ford D8TB-17C475-AA (1978-1979 F-Series Windshield Wiper Delay Module)**

The **Ford D8TB-17C475-AA** is a windshield wiper delay module used in **1978-1979 Ford F-150, F-250, and F-350** trucks and **Bronco** models. This part is part of the intermittent wiper system, which allows the driver to set a delay between wiper strokes. Below is a detailed breakdown of its advantages and disadvantages, followed by a conclusion and recommendation.

---

### **Pros of buying a D8TB-17C475-AA Wiper Delay Module**

1. **Direct OEM Replacement**

- This is an **original Ford part**, meaning it is designed to fit perfectly without modifications. It will function identically to the factory unit, ensuring proper compatibility with the truck s electrical system.

2. **Reliability and Durability**

- Ford s early electronic components, while basic by modern standards, were built to last if maintained properly. The D8TB module is a **mechanical-electronic hybrid**, meaning it uses a **rotary switch and timing mechanism** rather than a fully electronic circuit, which can be more durable in harsh conditions.

- Many original Ford parts from this era are still in use today in restored or well-maintained vehicles.

3. **Easy to Install**

- The module is a **relatively simple component** it plugs into the wiper motor harness and mounts near the firewall. No complex wiring or soldering is required, making it a straightforward DIY repair.

- Replacement is often cheaper than buying a **complete wiper motor assembly**, which may include the delay module as part of a larger unit.

4. **Functionality Without Modern Electronics**

- Unlike modern wiper systems that rely on **microcontrollers and complex programming**, this module uses a **mechanical timer**, which can be less prone to failure from electrical noise or software glitches.

- If the issue is purely a **delay module failure** (e.g., stuck switch, worn timing mechanism), replacing just this part can restore full wiper functionality without needing a full motor replacement.

5. **Availability of Replacement Parts**

- **Ford dealership parts departments** (may charge a premium)

- **Specialty classic Ford parts suppliers** (e.g., **RockAuto, eBay, or dedicated Bronco/F-Series forums**)

- **Restoration shops** that frequently source OEM or high-quality reproduction parts

- Unlike some **aftermarket knockoffs**, an OEM or reproduction D8TB module will have the correct **switch positions and timing** for the vehicle.

6. **Compatibility with Aftermarket Upgrades**

- If you plan to **upgrade the wiper motor** (e.g., to a **heavy-duty or variable-speed unit**), the D8TB module can still be used with compatible motors. Some aftermarket motors are designed to work with the original delay mechanism.

7. **Lower Cost Than Full Wiper Motor Replacement**

- Replacing just the **delay module ( $50 $150 depending on source)** is significantly cheaper than buying a **complete wiper motor assembly ( $200 $400)** if the motor itself is still functional.

- This makes it a **cost-effective solution** for vehicles where only the delay mechanism has failed.

8. **Historical and Restoration Value**

- For **restoration projects**, using an **OEM or reproduction D8TB module** ensures authenticity, which is important for **show-quality builds** or **classic vehicle enthusiasts** who prioritize period-correct parts.

---

### **Cons of buying a D8TB-17C475-AA Wiper Delay Module**

1. **Limited Availability and Lead Times**

- Order from a **specialty supplier**, which can take **weeks to arrive**.

- Purchase from a **used parts lot**, where availability is unpredictable.

- Buy a **reproduction part**, which may not be as durable as the original.

- **eBay and Facebook Marketplace** can be hit-or-miss some sellers may not provide the correct part number, leading to compatibility issues.

2. **Potential for Counterfeit or Incompatible Parts**

- Some sellers market **"Ford D8TB replacements"** that are actually **generic or aftermarket modules** with incorrect switch positions or timing. These may:

- Not fit properly in the wiring harness.

- Have **wrong switch settings** (e.g., intermittent delay may not work as intended).

- Lack the **mechanical durability** of an OEM part.

- **Always verify the part number and supplier reputation** before purchasing.

3. **Aging and Wear in Original Modules**

- If the module is **old and has been exposed to moisture, heat, or electrical corrosion**, it may fail prematurely even after replacement. Common issues include:

- **Sticky or jammed rotary switch** (due to dried-out lubricant).

- **Worn-out timing mechanism** (internal gears or springs may degrade over time).

- **Corroded or broken wiring** inside the module.

- In such cases, **replacing just the module may not solve the problem** the motor or harness may also need attention.

4. **Electrical Compatibility Issues**

- If the **wiper motor or wiring harness is damaged**, replacing just the delay module will **not fix intermittent wiper problems**. Possible underlying issues include:

- **Blown fuses** (common in older vehicles).

- **Corroded or broken connections** in the wiper switch or motor.

- **Faulty ground connections** (a common issue in classic trucks).

- Before purchasing the module, **test the wiper system** to ensure the failure is isolated to the delay mechanism.

5. **Limited Customization**

- Unlike modern wiper systems, the **D8TB module has fixed delay settings** (typically **2 10 second intervals**). You **cannot adjust the delay time** it is set by the module s internal timing mechanism.

- If you want **variable delay settings**, you would need to **replace the entire wiper motor assembly** with a modern or aftermarket unit.

6. **Potential for Overkill on Modern Trucks**

- If you are **not restoring a classic truck** but simply need a wiper fix, some modern **aftermarket delay modules** (or even **universal intermittent wiper switches**) may be a **simpler and cheaper alternative**.

- However, for **authenticity in a restoration**, the OEM D8TB is the best choice.

7. **Difficulty in Testing Before Purchase**

- Receiving a **dead or defective part**.

- Getting a **wrong part number** that doesn t fit.

- Always **check reviews, supplier ratings, and return policies** before purchasing.

8. **Labor Costs if Professional Installation is Needed**

- While the module is **relatively easy to install**, if you are **not comfortable with electrical work**, a mechanic may charge **$50 $100 for installation**.

- For a **restoration project**, this may be justified, but for a **quick fix**, DIY is preferable.

---

### **Conclusion**

The **Ford D8TB-17C475-AA windshield wiper delay module** is a **practical and reliable solution** for **1978-1979 F-Series and Bronco owners** experiencing intermittent wiper issues. It offers **OEM compatibility, durability, and ease of installation**, making it ideal for:

- **Restoration projects** where authenticity is important.

- **Vehicles where only the delay mechanism has failed** (and the motor is still functional).

- **Enthusiasts who prefer mechanical over electronic wiper systems**.

- **Availability can be an issue**, requiring patience or careful sourcing.

- **Counterfeit parts are a risk**, so verification is essential.

- **Underlying electrical problems** (motor, harness, switch) may persist if not addressed.

If you are **certain the issue is isolated to the delay module** and you have **verified the part number and supplier**, this is a **solid choice**. For **non-restoration vehicles**, consider whether an **aftermarket or universal intermittent switch** might be a more convenient alternative.

---

### **Recommendation**

- **Purchase from a reputable supplier** (e.g., **RockAuto, eBay with verified sellers, or a classic Ford parts dealer**).

- **Check for a reproduction D8TB module** if OEM is unavailable brands like **Deluxe Auto Parts** or **Ford Restoration Parts** often carry high-quality reproductions.

- **Test the wiper system first** to confirm the delay module is the only faulty component.

- **Consider an aftermarket intermittent wiper switch** (e.g., **Universal or Ford-compatible units**) if you don t

Details:

INTERMITANT WIPER MODULE FROM A 1978 F250.

part #: d8tb17c475 price

• $69.99

specifications interiocatruc:

• for models: F150, F250, F350, Bronco
• for makes: Ford
• for years: 1978-1979
• mpn: D8tb-17c475-aa
• type: Dash Panel
• placement on vehicle: Dashboard
• country of origin: United States

shipping interiocatruc:

• class: Standard
• transit: 3-8 Days
• cost: $10.50
• service: USPS Ground Advantage, UPS Ground
• carrier: USPS, UPS
• type: Calculated

offer interiocatruc:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: April 6, 2026

general interiocatruc:

• condition: Used
• Interior Parts Accessories > Dash Panels Glove Boxes > Dash Panels

returns interiocatruc:

• policy: No Returns

payments interiocatruc:

• wallet: Paypal
• other
• credit card: Mastercard

seller interiocatruc:

• # reviews: 23093
• rating: 99.0%
• city: Spencer, New York

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