QSB5.9 Engine Electrical Wiring Harness Assembly 3970377 / 3991823

JISION – Professional Construction Machinery Parts Supplier

Product Name: Engine Electronic Control Module Wiring Harness Assembly
Part Number: 3970377 / 3991823
Engine Model: QSB5.9
Category: Engine Electrical System / ECM Harness

The 3970377 / 3991823 Electronic Control Module Wiring Harness is designed for QSB5.9 engines. It serves as the critical connection between the ECM and various engine components, including sensors, injectors, actuators, and power supply circuits. The harness is manufactured using high-quality copper conductors and durable protective sheathing to withstand harsh construction and industrial operating environments. The part number 3970377 is identified by as an Electronic Control Module Wiring Harness for certain 5.9L B-series applications.

• OEM-standard manufacturing
• High conductivity copper wire core
• Oil-resistant and abrasion-resistant outer covering
• Stable signal transmission
• Excellent resistance to vibration and temperature changes
• Easy installation and reliable performance

• QSB5.9 Engines
• Excavators
• Wheel Loaders
• Road Machinery
• Generator Sets
• Industrial Equipment
• Construction Machinery

⚠ Please provide:

• Engine Serial Number (ESN)
• Engine Nameplate Photo
• Original Part Number

This allows us to verify the correct harness configuration before shipment.

• Professional supplier of construction machinery electrical parts
• Large inventory available
• Fast quotation and technical support
• Global shipping service
• Quality tested before delivery

Need other ECMs, wiring harnesses, monitors, sensors, or diagnostic tools? Contact JISION for a complete solution.