Electronic Control Module Wiring Harness 4939039

Title: Electronic Control Module Wiring Harness 4939039 For Engine B4.5 NT743 QSB3.3 QSB6.7 Excavator Engine Wire Harness Construction Machinery Electrical Replacement Parts

Keywords: 4939039, wiring harness, engine wiring harness, ECM wiring harness, B4.5 wire harness, QSB3.3 harness, QSB6.7 wiring harness, NT743 wiring harness, excavator electrical harness, heavy‑duty engine spare parts

🔹Product Overview

This electronic control module wiring harness Part No.4939039 is a core electrical connecting component for B4.5, NT743, QSB3.3, QSB6.7 diesel engine. It establishes stable signal and power connection among ECM, sensors, injectors and other engine electrical components, ensures accurate transmission of control signals. Damaged or aging wiring harness may trigger engine fault codes, intermittent stall, hard starting, sensor signal loss and abnormal engine operation. Our replacement wiring harness is strictly manufactured and circuit‑tested according to OEM technical standards for direct replacement.

🔹Product Specifications

🔹Key Features

✅ Produced strictly in accordance with OEM layout, pin definition and length, perfect matching for B4.5 NT743 QSB3.3 QSB6.7 engine

✅ Adopts high‑temperature and oil‑resistant wires, waterproof sealed connectors, excellent anti‑aging, anti‑abrasion performance, adapts harsh high‑temperature engine bay environment

✅ Every harness undergoes full‑range circuit continuity and insulation test before delivery, avoid open‑circuit, short‑circuit risks

✅ Effectively solve engine intermittent shutdown, difficult startup, random fault alarm, sensor signal missing caused by old wiring harness damage

✅ Restore stable communication between ECU and each actuator & sensor

✅ Plug‑and‑play design, complete connectors and fixed buckles, no need for extra wiring modification

✅ Reduce equipment downtime for machinery repair and maintenance sites

🔹Application Scope

Suitable for B4.5, NT743, QSB3.3, QSB6.7 diesel engine fitted on excavators and other heavy‑duty construction machinery & commercial vehicles. Ideal replacement part for original defective ECM wiring harness. Widely used by machinery repair workshops, equipment service centers and construction machinery spare‑parts wholesale suppliers.

🔹Our Advantages

We supply full range of excavator and construction machinery spare parts, covering engine assemblies, hydraulic components and various electrical accessories including sensors, solenoid valves and wiring harnesses. All products go through strict inspection before packing. We support small sample orders and large‑volume wholesale orders. Fast delivery and professional pre‑sales & after‑sales technical support. If you require other spare parts for related machine models, please send us part numbers for quotation.

🔹Packaging & Shipping

• Packaging: Each wiring harness adopts shock‑proof and dust‑proof inner protection, packed in standard export carton. Custom wooden case is available for bulk orders to avoid damage during long‑distance sea transit. Moisture‑proof treatment for overseas shipment.
• Shipping Methods: Support DHL/FedEx/UPS/TNT express, air freight, sea freight, LCL & FCL.
• Lead Time: 1‑3 working days for in‑stock goods; 7‑15 working days for out‑of‑stock bulk orders.
• Loading Port: Major ports in China, shipment can be arranged via customer‑designated freight forwarder.

🔹Contact Us

1. Please send your inquiry with part number, machine model, quantity and your special requirements, we will reply you within 24 working hours.
2. OEM & customized service are available for large‑volume orders.
3. Professional technical support for parts matching confirmation and installation guidance.
4. Welcome machinery dealers, repair shops and trading companies to establish long‑term cooperation.