HARLEY-DAVIDSON 70405-99Y Box Lh Switch Buell/harley N0159.B

( Brand: Harley-davidson ), ( Manufacturer Part Number: 70405-99Y ), ( Type: Switch Control ), ( Placement On Vehicle: Left )

Review HARLEY DAVIDSON New Open Box Buell/harley Lh Switch Assembly fits BUELL

The **Harley-Davidson 70405-99Y Box/Handlebar Switch Assembly (Part Number: LH N0159.B)** is a precision-engineered electrical component designed exclusively for Harley-Davidson motorcycles, ensuring seamless integration with the brand s iconic riding experience. This high-quality switch assembly is crafted to replace the left-hand (LH) box/handlebar switch, a critical component that controls essential functions such as the turn signals, high-beam illumination, and sometimes the horn, depending on the specific model configuration. Engineered with Harley-Davidson s signature attention to durability and performance, this switch is built to withstand the demands of rigorous riding conditions, from urban commutes to long-distance cruises. The assembly features a robust, weather-resistant construction, complete with a durable housing and corrosion-resistant contacts, ensuring reliable operation even in harsh environments. Compatible with a range of Harley-Davidson models equipped with the N0159.B switch, this part is a direct replacement for OEM (Original Equipment Manufacturer) components, guaranteeing an exact fit and seamless functionality without the need for modifications. Whether you re restoring a classic bike or upgrading an existing model, this switch assembly delivers the precision and reliability riders expect from Harley-Davidson, maintaining the integrity of the motorcycle s electrical system while enhancing its overall performance and longevity.

### **Pros and Cons of buying a Harley-Davidson 70405-99Y Box/Buell LH Switch (N0159.B)**

#### **Overview**

The **Harley-Davidson 70405-99Y Box/Buell LH Switch (N0159.B)** is a wiring harness module designed to interface between a Harley-Davidson motorcycle and a Buell motorcycle, enabling compatibility for certain electrical systems. This part is often used in conversions or when integrating Buell components into a Harley platform.

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### **Pros**

1. **Compatibility for Conversions**

- Allows owners of Harley-Davidson motorcycles to install Buell-specific electrical components (such as lighting, sensors, or switches) that may not otherwise fit.

- Useful for custom builds where Buell parts are preferred for performance or aesthetics.

2. **Reduces Wiring Complexity**

- Acts as a bridge between Harley and Buell wiring systems, simplifying the integration process compared to rewiring everything manually.

- Helps avoid common electrical issues that arise from mismatched wiring harnesses.

3. **Supports Aftermarket Modifications**

- Enables the use of aftermarket parts designed for Buell motorcycles on Harley platforms, expanding customization options.

- May be required for certain lighting upgrades, sensor installations, or electronic control modules (ECMs).

4. **Potential Cost Savings**

- Avoids the need for a full custom wiring harness, which can be expensive to fabricate.

- May be cheaper than sourcing fully compatible Harley parts that include Buell-compatible features.

5. **Community and Forums Support**

- Many Harley and Buell enthusiasts have experience with this switch, providing troubleshooting guides, installation tips, and compatibility feedback.

- Online communities (e.g., Harley-Davidson forums, Buell forums) can offer insights into common issues and solutions.

---

### **Cons**

1. **Limited Availability and Sourcing Challenges**

- Harley-Davidson and Buell parts have different lifespans, and this specific switch may be harder to find compared to standard Harley wiring components.

- May require purchasing from specialty suppliers, eBay, or used markets, increasing the risk of counterfeit or damaged parts.

2. **Potential Compatibility Issues**

- Not all Harley models may fully support this switch, especially older or newer models with updated electrical systems.

- Some Buell components may still require additional adapters or modifications to work seamlessly.

- Risk of electrical conflicts if the wiring harness is not perfectly matched to the motorcycle s ECM or sensors.

3. **Installation Complexity**

- Requires a moderate level of mechanical and electrical knowledge to install correctly. Improper installation can lead to short circuits, fuse blowing, or sensor malfunctions.

- May necessitate additional wiring or splicing, which could complicate the build.

4. **Reliability Concerns**

- As a bridging component, it is not a standard Harley or Buell part, which could lead to reliability issues over time.

- If the switch fails, it may not be as easily replaceable as an OEM part, requiring sourcing or custom repairs.

5. **Cost Relative to Alternative Solutions**

- While it may save money compared to a full custom harness, the price of the switch itself (if new) or the cost of sourcing a used one may still be significant.

- In some cases, it may be cheaper to find a fully compatible Harley part or adapt existing wiring rather than using this switch.

6. **Potential for Voiding Warranties**

- Modifying a motorcycle s electrical system with non-OEM parts may void manufacturer warranties, especially if the switch is involved in critical functions like ignition or fuel injection.

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### **Ending Conclusion**

The **Harley-Davidson 70405-99Y Box/Buell LH Switch (N0159.B)** is a niche but valuable component for enthusiasts looking to integrate Buell parts into a Harley platform. It offers a practical solution for conversions and custom builds by simplifying wiring compatibility, but it is not without drawbacks. The decision to purchase this part depends on your specific project, technical comfort level, and willingness to troubleshoot potential issues.

If you are certain about the compatibility of your motorcycle model with this switch and are prepared for potential installation challenges, it can be a cost-effective and efficient choice. However, if you are unsure about wiring compatibility or lack experience with motorcycle electrical systems, consulting a professional or exploring alternative wiring solutions may be safer.

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### **Recommendation**

1. **Verify Compatibility**

- Confirm that your Harley-Davidson model is compatible with this switch. Check with Harley-Davidson forums, Buell communities, or a trusted mechanic to ensure no known conflicts exist with your specific bike.

2. **Source from a Reputable Supplier**

- Purchase from a verified seller (e.g., Harley-Davidson authorized dealers, trusted online marketplaces, or specialty motorcycle parts stores) to avoid counterfeit or damaged parts.

3. **Gather Installation Resources**

- Obtain detailed installation guides, wiring diagrams, and video tutorials before attempting installation. If possible, seek help from someone experienced with Harley/Buell conversions.

4. **Consider Professional Installation**

- If you are not confident in your electrical skills, hire a motorcycle electrician or a shop with experience in Harley/Buell conversions to ensure proper installation and avoid costly mistakes.

5. **Test Thoroughly After Installation**

- After installation, thoroughly test all electrical functions (lights, sensors, switches) to ensure everything operates correctly. Monitor for any warning lights or unusual behavior that may indicate wiring issues.

6. **Alternative Solutions**

- Finding a fully compatible Harley part that includes Buell-compatible features.

- Using a custom wiring harness designed for your specific conversion.

- Adapting existing wiring with relays or additional switches to achieve the desired functionality.

Ultimately, this switch is a useful tool for the right project, but it requires careful planning and execution to ensure success. For most enthusiasts, it is best suited for those with intermediate to advanced mechanical and electrical skills or those willing to invest time in learning the process.

Details:

New inventory NEW open box Buell/Harley Davidson LH Switch Assembly. P/N: 70405-99Y, N0159.B, NEW IN ORIGINAL PACKAGING, UNUSED. It is very expensive to list and ship items.

part #: 7040599y prices

• $74.95-$100.00

specifications cycleswitches:

• for models: Buell
• for makes: Buell, Harley
• brand: Harley-davidson
• mpn: 70405-99y
• type: Switch Control
• placement on vehicle: Left

general cycleswitches:

• condition: Used
• Electrical Ignition Components > Electrical Ignition Sensors Switches > Ignition Key Switches

payments cycleswitches:

• wallet: Paypal
• other
• credit card: Diners-club

seller cycleswitches:

• rating: 99.9%
• city: Walker, Louisiana
• # reviews: 7923

returns cycleswitches:

• policy: No Returns

offer cycleswitches:

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

shipping cycleswitches:

• transit: 3-8 Days
• cost: $12.00
• type: Fixed
• service: Standard
• class: Standard

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