Upgrading Auxiliary Lighting on the Kubota U35-4

[MikePhua]

Introduction
The Kubota U35-4 compact excavator is a versatile machine designed for tight spaces and demanding tasks. Equipped with a 24.8-horsepower engine and advanced hydraulic systems, it offers impressive performance. However, operators often seek to enhance visibility during low-light conditions by upgrading the auxiliary lighting system. This article provides a comprehensive guide on adding auxiliary lighting to the U35-4, addressing common challenges and offering practical solutions.
Understanding the Electrical System
Before embarking on any modifications, it's crucial to understand the U35-4's electrical system. The machine features a 12V DC electrical system with a main fuse panel located within the operator's cab. This panel includes fuses for various components, including lighting circuits. For instance, the 50A main power fuses protect the primary electrical circuits, while the 80A alternator fuse safeguards the charging system. When adding auxiliary lights, it's essential to integrate them into this system without overloading existing circuits.
Selecting the Right Auxiliary Lights
Choosing appropriate auxiliary lights is vital for ensuring adequate illumination and compatibility with the excavator's electrical system. Operators often opt for LED flood lights due to their energy efficiency and durability. For example, Rigid Industries offers a range of LED flood lights suitable for heavy equipment applications. These lights typically come with pre-wired harnesses and switches, simplifying the installation process. It's advisable to select lights that match the machine's voltage and current specifications to prevent electrical issues.
Installation Process

1. Preparation: Ensure the excavator is parked on a level surface with the engine turned off and the key removed. Disconnect the negative terminal of the battery to prevent accidental electrical shorts.
   
2. Mounting the Lights: Select suitable locations for mounting the auxiliary lights. Common positions include the front of the boom or the upper corners of the cab. Use appropriate brackets and hardware to securely attach the lights, ensuring they do not obstruct the operator's view or interfere with other components.
   
3. Wiring: Run the wiring harness from the lights to the fuse panel, avoiding areas with high heat or moving parts. It's recommended to use a relay to control the lights, as this allows for higher current flow without overloading the switch. The relay should be wired to a fused circuit that is only active when the ignition is on, preventing battery drain when the machine is off. For instance, tapping into the existing boom light circuit can provide a convenient power source.
   
4. Switch Installation: Install the switch in a location that is easily accessible to the operator. Ensure the switch is rated for the current draw of the auxiliary lights. Label the switch appropriately to avoid confusion during operation.
   
5. Testing: Reconnect the battery and test the auxiliary lights to ensure they function correctly. Check for any flickering or dimming, which could indicate wiring issues or insufficient power supply.
   

Safety Considerations

• Fusing: Always use appropriately rated fuses to protect the electrical circuits. Overcurrent protection is essential to prevent wiring damage or fire hazards.
  
• Wiring: Use wiring that is rated for outdoor use and can withstand the environmental conditions of the job site. Properly secure all wires to prevent chafing or accidental disconnections.
  
• Switch Placement: Install switches in locations that do not distract the operator or interfere with other controls. Consider using illuminated switches for visibility in low-light conditions.
  

Conclusion
Upgrading the auxiliary lighting on the Kubota U35-4 can significantly enhance visibility during nighttime operations or in low-light environments. By understanding the electrical system, selecting appropriate lighting components, and following proper installation procedures, operators can achieve a safe and effective lighting solution. Always prioritize safety and consult the operator's manual for specific guidelines related to electrical modifications.