BMW 8357938 Engine Wire Harness G310R

( Manufacturer Part Number: 8357938 ), ( Part Type: Wire Engine Harness )

Review BMW Main Engine Wire Harness Oem fits 2017–2018

The **BMW 8357938 G310R Engine Wire Harness** is a precision-engineered electrical component specifically designed for the **2017 and 2018 BMW G310R (BMW R 1250 GS Adventure)**, ensuring seamless connectivity and optimal performance within the motorcycle s electrical system. This high-quality harness is meticulously crafted to meet BMW s stringent manufacturing standards, featuring durable, flame-retardant materials that guarantee long-lasting reliability even under the demanding conditions of off-road and long-distance travel. The wiring is carefully routed to minimize interference, reducing the risk of signal degradation or electrical noise that could affect critical functions such as ignition, fuel injection, or instrument cluster operation. Each wire within the harness is color-coded and labeled for easy identification during installation or troubleshooting, streamlining maintenance and ensuring that technicians can quickly locate and connect the correct terminals. The robust construction includes heat-resistant insulation and corrosion-proof connectors, safeguarding against environmental factors like moisture, dust, and temperature fluctuations, which are particularly prevalent in adventure touring scenarios. Whether navigating rugged terrain or cruising on highways, this wire harness provides a stable electrical foundation, contributing to the overall efficiency, safety, and longevity of the G310R s powertrain and auxiliary systems. Ideal for both original equipment replacement and aftermarket upgrades, this harness is a testament to BMW s commitment to engineering excellence, delivering a perfect blend of performance and durability for enthusiasts who demand nothing less than perfection from their motorcycle.

### **Pros and Cons of buying a BMW 8357938 G310R Engine Wire Harness (2017 2018 Models)**

1. **Direct Fitment** The harness is specifically designed for the BMW G310R (2017 2018), ensuring compatibility without modifications. This reduces the risk of electrical issues caused by mismatched wiring.

2. **OEM-Quality Components** BMW s wiring harnesses are built to meet strict automotive standards, providing reliable connections and durability. Using an authentic or high-quality aftermarket harness minimizes the risk of poor soldering or loose terminals.

3. **Prevents Electrical Problems** The G310R s engine harness is critical for proper engine function, fuel injection, and sensor communication. A faulty or damaged harness can lead to misfires, poor performance, or even engine failure. Replacing it ensures stable electrical flow.

4. **Compatibility with Upgrades** If you plan to modify your bike (e.g., ECU tuning, exhaust, or performance parts), a new harness ensures that new components integrate correctly without wiring conflicts.

5. **Long-Term Reliability** Unlike cheap aftermarket harnesses that may degrade quickly, a quality harness (whether OEM or reputable aftermarket) is designed for longevity, reducing the need for frequent replacements.

6. **Easier Installation** Since it s a direct replacement, installation is straightforward if you have basic mechanical skills. BMW s wiring is well-documented, and many online guides exist to assist.

7. **Warranty Coverage** If purchasing from a trusted dealer or BMW-approved supplier, the harness may come with a warranty, providing peace of mind against defects.

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1. **Cost** BMW parts, even aftermarket, can be expensive. The harness itself may cost between **$200 $400**, depending on the source (OEM vs. aftermarket). Labor costs for installation (if not DIY) will add to the expense.

2. **Complexity of Installation** While not extremely difficult, wiring harness replacement requires careful routing, terminal crimping, and sometimes soldering. Mistakes can lead to short circuits or poor connections. If unsure, professional installation is recommended.

3. **Potential for Counterfeit Parts** Buying from untrusted sellers (e.g., eBay without verification or unknown online marketplaces) risks receiving a low-quality or fake harness. Always purchase from authorized dealers or reputable suppliers.

4. **Time-Consuming** If doing it yourself, the job may take **4 8 hours**, depending on your experience. This includes disconnecting components, removing the old harness, and ensuring proper routing of the new one.

- **Crimping tools** (if not already owned)

- **Heat shrink tubing & electrical tape** (for insulation)

- **Diagnostic tools** (to verify proper function post-installation)

- **Professional labor** (if not DIY)

6. **Risk of Overlooking Hidden Issues** If the original harness was damaged due to a deeper problem (e.g., water ingress, corrosion, or a failing connector), replacing just the harness may not solve the root cause. A thorough inspection of related components (e.g., connectors, sensors) is advisable.

7. **Limited Availability of Aftermarket Alternatives** While OEM and some high-end aftermarket options exist, budget-friendly alternatives may lack the same build quality or longevity.

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### **Conclusion**

The **BMW 8357938 G310R engine wire harness (2017 2018)** is a **necessary replacement** if your bike is experiencing electrical issues such as misfires, erratic sensor readings, or intermittent power loss. The harness is a **critical component** that ensures proper engine operation, and neglecting it can lead to more severe (and costly) problems down the line.

- **Symptoms of harness failure** (e.g., check engine lights, poor throttle response, sensor errors).

- **Budget** Weigh the cost against the potential damage from continuing to ride with a faulty harness.

- **Installation confidence** If unsure, professional installation is worth the extra cost to avoid mistakes.

- **Source reliability** Purchase from **authorized BMW dealers, reputable aftermarket suppliers, or trusted online retailers** to avoid counterfeit parts.

---

### **Recommendation**

- **Get a diagnostic scan** to confirm if the issue is electrical (e.g., P0300 P0308 misfire codes, sensor faults).

- **Inspect the harness visually** for fraying, corrosion, or broken terminals. If damaged, replacement is strongly advised.

- **OEM (BMW Approved):** More expensive but guaranteed compatibility and quality.

- **High-Quality Aftermarket:** Brands like **Bosch, Deka, or Motoplat** offer reliable alternatives at a lower cost.

- **Avoid unknown sellers** to prevent receiving subpar or fake parts.

- You lack experience with motorcycle wiring.

- The harness requires precise routing near critical components (e.g., near the battery or ECU).

- You want to ensure proper crimping and insulation to prevent future issues.

- Follow **BMW s wiring diagrams** (available in the owner s manual or online).

- Use **proper crimping tools** and **heat shrink tubing** to secure connections.

- **Test the bike thoroughly** post-installation (check for proper sensor readings and engine performance).

- If your harness is old (especially if the bike has high mileage), consider **proactively replacing it** before failure occurs.

- Keep the wiring bay **clean and dry** to prevent corrosion.

- Electrical issues are confirmed.

- You prioritize long-term reliability.

- You re either experienced in wiring work or willing to pay for professional installation.

- The symptoms are unrelated to the harness (e.g., mechanical issues like fuel pump failure).

- You re on a tight budget and cannot afford the cost or potential downtime.

- You lack the time or skills for a careful installation.

- **Replace the harness** if electrical problems persist after ruling out other causes.

- **Invest in quality** to avoid repeated failures.

- **Document the process** in case future issues arise (useful for warranty claims or troubleshooting).

For most riders experiencing **persistent electrical gremlins**, this is a **smart upgrade** that can restore confidence in the bike s performance.

Details:

GSR veers 1710 GS 9.9.1 1710 , GSR 1736 9.9.5 1736 REMOVED OFF OF 2018.

part #: 8357938 prices

• $61.95-$149.99

specifications cyclevintagee:

• for makes: Bmw
• for years: 2017-2018
• mpn: 8357938
• part type: Wire Engine Harness

returns cyclevintagee:

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

offer cyclevintagee:

• quantity: 1
• options: Ship-to-home
• availability: In Stock
• started: May 19, 2026
• sold: 0
• best offers: True

payments cyclevintagee:

• wallet: Google-pay
• credit card: Visa
• other

seller cyclevintagee:

• city: Sylmar, California
• rating: 100.0%
• # reviews: 744

general cyclevintagee:

• condition: Used
• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories

shipping cyclevintagee:

• carrier: UPS
• class: Standard
• transit: 3-8 Days
• cost: $18.00
• type: Fixed
• service: UPS Ground

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