Precision - Engineered Wiring Harness 3968886/3966069 Compatible for Cummins Engine 6CT Qsl9 6b5.9 6c8.3 6L8.9

• Customization: Available
• Certification: ISO9001
• Standard Component: Standard Component
• Model NO.: Wiring Harness 3968886/3966069
• Technics: Forging
• Material: Iron
• Type: Wiring Harness
• Weight: 0.13kg
• Transport Package: Wooden
• Specification: 15cm*6.5cm*7cm
• Trademark: zhengwei
• Origin: China/USA
• Production Capacity: 500000

Product Description

Introduction

The Wiring Harnesses, identified by part numbers 3968886 and 3966069, are essential components for Cummins engines, specifically designed for models 6CT, QSL9, 6B5.9, 6C8.3, and 6L8.9. These harnesses act as the "nervous system" of the engine, facilitating seamless electrical communication between various engine components. By ensuring reliable power and signal transmission, they play a crucial role in maintaining the engine's performance, efficiency, and overall functionality.

Parameter	Details
Part Numbers	3968886, 3966069
Wire Material	High - purity copper (99.97% IACS conductivity)
Insulation Material	Flame - retardant, heat - resistant thermoplastic (UL 94 V - 0 rating)
Operating Temperature Range	- 40°C to 150°C
Number of Circuits	28 circuits
Maximum Current Rating	120 A (main power circuit), 5 A (signal circuits)
Connector Type	Specialized anti - corrosion connectors with locking mechanisms, rated for IP67 dust and water protection
Wire Gauge	Main power wires: 8 AWG; Signal wires: 18 - 22 AWG
Resistance per 100m	Main power wires: ≤0.05 Ω; Signal wires: ≤0.5 Ω
Tensile Strength of Crimp Connections	≥80% of wire rated strength

Function and Working Principle

The sensor operates based on the principle of electromagnetic induction. It consists of a permanent magnet, a coil, and a ferromagnetic target wheel attached to the crankshaft. As the crankshaft rotates, the teeth of the target wheel pass by the sensor, causing a change in the magnetic field around the coil. This change induces an alternating current (AC) voltage in the coil. The frequency and amplitude of this voltage are directly related to the speed and position of the crankshaft. The ECM then analyzes this electrical signal to determine the exact position of the crankshaft at any given moment, which is vital for precise engine control.

Cummins 6CT Engine

Cummins QSL9 Engine

 Cummins 6B5.9 Engine

For the Cummins 6CT engine, commonly used in heavy - duty trucks and construction equipment, the 3968886 and 3966069 wiring harnesses ensure stable electrical connections for components such as the fuel injection system, ignition system, and engine sensors. In construction machinery operating in dusty and vibrating environments, the harnesses' robust design and secure connectors prevent electrical disruptions, ensuring continuous and reliable engine operation. This helps maintain the productivity of the equipment, reducing downtime caused by electrical failures. The 28 - circuit design of the harness provides dedicated pathways for each critical component, minimizing signal interference.

In the QSL9 engine, which powers large - scale industrial equipment and some heavy - duty trucks, these wiring harnesses are crucial for handling the high - power demands of the engine's advanced control systems. The high - conductivity copper wires enable efficient power delivery to components like the turbocharger actuator and electronic control module (ECM). The 8 AWG main power wires can carry up to 120 A of current, ensuring sufficient power supply even under peak loads. The heat - resistant insulation protects the wires from the intense heat generated by the engine, ensuring long - term reliability even under continuous heavy - load operation.

For the 6B5.9 engine, often found in light - to - medium - duty trucks and buses, the wiring harnesses simplify the electrical installation process. Their plug - and - play design ensures a direct fit, eliminating the need for complex modifications. The precise signal transmission capabilities of the harnesses, with 18 - 22 AWG signal wires having low resistance, contribute to the engine's smooth operation, enhancing fuel efficiency and reducing emissions by enabling accurate control of the fuel injection and ignition timing.

 High - Quality Materials

Precision Manufacturing

Constructed with premium - grade materials, these wiring harnesses are built to withstand the harsh operating environments of Cummins engines. The wires are made from high - purity copper with a conductivity of 99.97% IACS (International Annealed Copper Standard), which offers excellent electrical conductivity, reducing power loss and minimizing the risk of overheating. The insulation around the wires is composed of flame - retardant, heat - resistant thermoplastic material with a UL 94 V - 0 flammability rating, capable of withstanding continuous operating temperatures ranging from - 40°C to 150°C. This ensures that the harness remains functional even in extreme cold or high - heat conditions often encountered in industrial and automotive applications.

Each wiring harness undergoes a meticulous manufacturing process. The wires are precisely cut, stripped, and crimped to ensure secure connections. The harnesses are then assembled with high - precision connectors that are designed to fit snugly into the corresponding sockets on the engine components. These connectors feature anti - corrosion coatings and locking mechanisms to prevent loose connections, which could lead to electrical failures. The harness layout is optimized to reduce interference between different electrical signals, ensuring accurate and stable communication within the engine system. All crimp connections are tested to meet a tensile strength of at least 80% of the wire's rated strength to guarantee reliability.ur needs.

Benefits of Using Genuine Cummins Wiring Harnesses

Reliability: Genuine Cummins wiring harnesses, such as those with part numbers 3968886 and 3966069, are tested rigorously to meet the manufacturer's high - quality standards. They are designed to endure the vibrations, heat, and electrical stresses typical of Cummins engines, reducing the risk of unexpected failures and minimizing costly repairs.

Perfect Fit: Engineered specifically for the 6CT, QSL9, 6B5.9, 6C8.3, and 6L8.9 engines, these harnesses offer a precise fit. This ensures that all electrical connections are made correctly, avoiding issues like incorrect wiring or loose connections that could lead to engine malfunctions.

Optimal Performance: The high - quality materials and precision design of the harnesses contribute to the engine's optimal performance. By providing stable electrical communication, they enable the engine's control systems to function accurately, resulting in improved fuel economy, reduced emissions, and enhanced overall efficiency.

Warranty and Support: When purchasing genuine Cummins wiring harnesses, customers can enjoy the manufacturer's warranty. This provides assurance that in case of any defects or failures within the warranty period, the harnesses can be repaired or replaced. Additionally, Cummins offers comprehensive technical support, assisting customers with installation, troubleshooting, and maintenance.

Packaging and Delivery

The Wiring Harnesses are carefully packaged to prevent any damage during transit. They are typically placed in sturdy cartons with appropriate cushioning materials to protect them from impacts and vibrations. Delivery options can vary, and customers can choose from methods such as express shipping for urgent requirements or more cost - effective sea or land freight for larger orders. The delivery process is coordinated to ensure that the Wiring Harnesseseach the customers in a timely manner, minimizing any downtime for vehicle maintenance or repair.

Warranty

Cummins offers a warranty on these Wiring Harnesses , which provides customers with peace of mind. The exact terms of the warranty may vary depending on the region and the specific application. Generally, the warranty covers any manufacturing defects and ensures that in case of a problem, customers can get the  Wiring Harnesses repaired or replaced as per the warranty conditions. This warranty reflects Cummins' confidence in the quality of its products.

Company Profile

Sichuan Zhengwei Power Technology Co.,Ltd. is a comprehensive and diversified enterprise which established in 2009. Headquartered in No. 388 Huanghe Road, Xindu District, Chengdu, Sichuan Province.The company specializes in diesel generator sets, Cummins engine assembly, Cummins pure parts sales and after-sales service. The company not only has a rich product line, including high-quality diesel generator sets and all kinds of pure accessories, but also provides a full range of after-sales service to ensure the stable operation of customers' equipment. In addition, with strong technical strength and rich experience, the company focuses on the maintenance of all kinds of construction machinery at home and abroad, and can provide customers with efficient and professional mechanical equipment maintenance services, solve all kinds of equipment failures, and ensure the normal production and operation of customers. 

Adhering to the corporate purpose of "Let customers get more value", the company will, provide customers with more and better products and services, and jointly open our better cooperation prospects!

Main Product

Production Process

Packaging & Shipping

Certifications

International Partners

FAQ

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Q: What's the lead time for orders?

A: Standard models ship in 15–30 days; customized units require 60-90days.

Q: Do you provide after-sales service?

A: Yes, We have a very comprehensive after-sales system.

Q: Can I request a customized parts?

A: Absolutely! We offer tailored attachments.

Q: What documents do you provide for export?

A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).

Q: How do I place an order?

A: Contact us via email/phone for a quote, then confirm with a PO.

 

Q: I'm not sure if this part fits my engine.

A: Please contact our customer service. We will help you identify or find the parts that fit your engine.

Q: I need other numbered parts, but they are out of stock in your store

A: You didn't want this part? Please contact us.If you can't find what you're looking for in store, it doesn't mean we're out of stock, The possible reasons are:

l The product was not put on the shelves in time

l The product link was invalid

l The keyword you searched for was incorrect

l Your part number machine model serial number was incorrect.

l Category restrictions, more optional models cannot be uploaded.

Therefore, please be sure to contact our customer service to inquiry whether the goods you need are actually in stock.l am confident that we can provide the products you need

 

Q: How long does it take to ship after payment?

A: After you make the payment,we usually need 3 business days to stock up and we will ship it to you.lf the parts you purchased are relatively rare, we will need longer time to stock them, but we will inform you via email.