PETERBILT 2647749 Headlight Switch 579

( Manufacturer Part Number: 2647749 ), ( Part Type: Headlight Switch ), ( Side: Left )

Review PETERBILT Replaces 579 Headlight Switch Ga fits 2019

The **2019 Peterbilt Model 579 Headlight Switch (Part Number 2647749)** is a precision-engineered, heavy-duty electrical component designed exclusively for Peterbilt s iconic Model 579 semi-truck, a workhorse built for durability and performance in the demanding world of long-haul freight and commercial transportation. This headlight switch is a critical part of the truck s lighting system, ensuring reliable operation of the vehicle s high-beam, low-beam, turn signals, and clearance lights all essential for visibility, safety, and compliance with federal and state road regulations. Crafted from high-grade, corrosion-resistant materials, the switch is built to withstand the harsh conditions of daily trucking operations, including exposure to extreme temperatures, moisture, dust, and vibration, which can degrade lesser-quality components over time. Its robust construction features a durable metal housing with a sealed, weatherproof design to prevent electrical interference and ensure long-term functionality, even in the most challenging environments.

The **2647749 headlight switch** incorporates a tactile, ergonomic lever mechanism that provides clear, positive feedback to the operator, allowing for effortless and precise control of the truck s lighting settings. The switch is engineered to accommodate Peterbilt s advanced lighting systems, including LED and halogen headlights, ensuring seamless integration with the truck s electrical architecture. Its compact yet sturdy form factor is strategically positioned within the driver s cabin for easy access, reducing the need for the driver to reach or look away from the road, thereby enhancing safety and convenience during operation. Additionally, the switch is designed with Peterbilt s proprietary wiring and mounting standards in mind, guaranteeing a perfect fit and secure installation without the need for modifications or adapters.

For fleet managers and truck owners, this headlight switch represents a cost-effective solution for maintaining the reliability and efficiency of their Peterbilt Model 579 fleet. Its compatibility with OEM specifications ensures that it meets or exceeds the performance standards set by Peterbilt, reducing the risk of electrical malfunctions, flickering lights, or premature wear that can lead to costly downtime or safety hazards. Whether used as an original equipment replacement or as a proactive maintenance upgrade, this switch is a testament to Peterbilt s commitment to quality and the trucking industry s demand for dependable, high-performance components. By investing in the **2647749 headlight switch**, operators can extend the lifespan of their truck s lighting system, improve visibility on the road, and contribute to a safer, more efficient driving experience for both the driver and other motorists.

### **Pros and Cons of Buying a 2019 Peterbilt 579 Headlight Switch (Part Number: 2647749)**

1. **Direct Compatibility** This is an OEM (original equipment manufacturer) part designed specifically for the 2019 Peterbilt 579 model, ensuring a perfect fit without modifications.

2. **Reliability** Peterbilt vehicles are built for durability, and using genuine or high-quality aftermarket parts like this switch helps maintain the truck s performance and longevity.

3. **Safety and Visibility** A functional headlight switch ensures proper operation of the truck s lighting system, which is critical for nighttime driving, low-visibility conditions, and regulatory compliance.

4. **Ease of Installation** Since it is a standard replacement part, installation is typically straightforward, requiring only basic tools and minimal mechanical knowledge.

5. **Warranty Coverage** If purchased from an authorized dealer or a reputable supplier, the part may come with a warranty, providing peace of mind against defects.

6. **Prevents Further Damage** A failing headlight switch can cause intermittent lighting issues, which may lead to more extensive electrical problems if left unaddressed. Replacing it early prevents potential malfunctions.

7. **Cost-Effective for Long-Term Use** While the upfront cost may seem high, replacing a faulty switch avoids the risk of a complete lighting system failure, which could be more expensive to repair.

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1. **Higher Upfront Cost** Compared to generic or aftermarket alternatives, an OEM or high-quality replacement part may be more expensive, especially if purchased directly from Peterbilt or an authorized dealer.

2. **Potential Counterfeit Parts** If buying from an unverified seller (e.g., online marketplaces without authentication), there is a risk of receiving a counterfeit or low-quality part that fails prematurely.

3. **Labor Costs** If the owner lacks mechanical experience, hiring a technician to install the switch may add to the total expense.

4. **Limited Availability** Depending on the supplier, stock levels for this specific part may be low, leading to delays in receiving the part.

5. **Mixed Reviews on Aftermarket Alternatives** While OEM parts are reliable, some aftermarket switches may have inconsistent quality, leading to potential reliability issues if not sourced carefully.

6. **Electrical System Complexity** If the issue stems from a broader electrical problem (e.g., faulty wiring, fuse, or relay), replacing just the switch may not fully resolve the problem, requiring additional diagnostics.

7. **Time Investment** Even for a simple replacement, the process may take time, especially if troubleshooting is needed to confirm the switch is the root cause.

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The **2019 Peterbilt 579 headlight switch (part #2647749)** is a critical component for maintaining the truck s lighting system, which is essential for safety and compliance. The **pros outweigh the cons** for most operators, particularly those prioritizing reliability, longevity, and OEM quality. However, the **higher cost and potential for counterfeit parts** are valid concerns that must be addressed by purchasing from a trusted source.

If the switch is confirmed to be faulty (e.g., through testing or visible wear), replacing it with an **authentic OEM part or a high-quality aftermarket alternative** (from a reputable supplier) is the best course of action. For operators on a tight budget, verifying the exact issue (e.g., ruling out wiring or relay problems) before purchasing can prevent unnecessary expenses.

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1. **Verify the Problem** Before buying, confirm that the headlight switch is indeed the faulty component. Test other electrical components (fuses, relays, wiring) to avoid unnecessary replacements.

2. **Purchase from a Trusted Source** Buy the part from an **authorized Peterbilt dealer, a reputable truck parts distributor (e.g., RockAuto, PartsGeek, or local truck shops), or a verified online retailer** to ensure authenticity and warranty coverage.

3. **Consider Aftermarket Options (If Needed)** If the OEM part is unavailable or priced too high, research **highly rated aftermarket alternatives** (e.g., from brands like **Dorman, Motorcraft, or local specialty suppliers**) and check reviews for reliability.

4. **DIY or Professional Installation?**

- If comfortable with basic electrical work, **DIY installation** is cost-effective.

- If unsure, **hire a certified technician** to ensure proper installation and avoid voiding any existing warranties.

5. **Budget for Potential Additional Repairs** If the lighting system has recurring issues, consider a **full electrical diagnostic** to address underlying problems beyond just the switch.

**Final Verdict:** **Worth the investment** if the switch is confirmed faulty, as it ensures safe and compliant operation of the truck s lighting system. Prioritize **quality and authenticity** over cost to avoid long-term reliability issues.

Details:

Replaces 2019 PETERBILT 579 HEADLIGHT SWITCH, GA. If not, let us know how to earn your 5-star rating.

specifications tusilap:

• for makes: Peterbilt
• for years: 2019
• mpn: 2647749
• part type: Headlight Switch
• side: Left

offer tusilap:

• options: Ship-to-home
• quantity: 1
• sold: 0
• started: May 21, 2026
• availability: In Stock

payments tusilap:

• wallet: Google-pay
• credit card: Diners-club
• other

shipping tusilap:

• transit: 2-7 Days
• service: UPS Ground
• cost: $0.00
• type: Fixed
• class: Standard
• carrier: UPS

seller tusilap:

• rating: 99.1%
• # reviews: 10581
• city: Athens, GA

returns tusilap:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

general tusilap:

• condition: Used
• Commercial Truck Parts > Lighting > Other Lighting

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