4987668
Wiring Harness
Cummins®

The Cummins 4987668 Wiring Harness is a specialized component designed for use in commercial trucks. It serves as a part of the vehicle’s electrical system, facilitating the connection between various electrical components and the truck’s power source. This wiring harness is significant in ensuring the reliable operation of electrical systems within commercial trucks, contributing to overall vehicle performance and safety.

Basic Concepts of Wiring Harnesses

A wiring harness is an assembly of wires, connectors, and sometimes switches and relays that transmit electrical power and signals throughout a vehicle. It consists of multiple wires bundled together, often protected by a sheath or conduit, to prevent damage and reduce electromagnetic interference. Within a vehicle’s electrical system, the wiring harness plays a role in connecting the battery to various electrical components, such as lights, sensors, and control units, enabling them to function correctly ¹.

Purpose of the Cummins 4987668 Wiring Harness

This Cummins part is specifically designed to integrate with the electrical systems of commercial trucks. It facilitates the distribution of electrical power from the battery to critical components, including the engine control module, sensors, and actuators. By providing a structured and protected pathway for electrical signals and power, this wiring harness plays a role in ensuring the efficient and reliable operation of the truck’s electrical systems.

Key Features

The Cummins 4987668 Wiring Harness is characterized by its robust design and high-quality materials. It is constructed using durable wires and connectors that are resistant to vibration, moisture, and temperature extremes, common in commercial truck environments. The harness is also designed with precision to fit snugly within the truck’s chassis, reducing the risk of damage from moving parts and ensuring a secure connection to all electrical components.

Benefits of Using the Cummins 4987668 Wiring Harness

Utilizing this Cummins part in commercial trucks offers several advantages. It enhances the efficiency of the electrical system by providing a direct and protected pathway for power and signals. This results in improved reliability and performance of the truck’s electrical components. Additionally, the harness contributes to safety by reducing the risk of electrical faults and ensuring that all systems operate within their designed parameters.

Installation Considerations

When installing the Cummins 4987668 Wiring Harness, it is important to follow manufacturer guidelines to ensure proper fitment and function. Preparatory steps may include disconnecting the battery to prevent electrical shocks and ensuring the truck’s chassis is clean and free of debris. Tools required for installation may include wire cutters, crimping tools, and a multimeter for testing connections. Careful attention should be paid to routing the harness to avoid sharp edges and moving parts, which could cause damage over time.

Maintenance and Troubleshooting

To ensure the longevity and optimal performance of the Cummins 4987668 Wiring Harness, regular maintenance is recommended. This includes inspecting the harness for signs of wear, corrosion, or damage, and ensuring all connections are secure and free of debris. Common issues that may arise include loose connections, damaged wires, or corrosion at connectors. Troubleshooting methods may involve using a multimeter to test for continuity and resistance, and repairing or replacing damaged sections as necessary ².

Safety Precautions

When working with the Cummins 4987668 Wiring Harness, observing electrical safety practices is paramount. This includes disconnecting the battery before beginning any work to prevent electrical shocks. Additionally, using insulated tools and wearing protective gear, such as gloves and safety glasses, can help protect against injuries. Handling the wiring harness with care, avoiding sharp bends or twists, ensures its integrity and longevity.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established itself as a trusted name in the commercial truck industry, known for its commitment to quality, innovation, and customer satisfaction. The company’s products are designed to meet the demanding requirements of commercial applications, ensuring reliability, efficiency, and performance.

Wiring Harness 4987668 Compatibility with Cummins Engines

The Wiring Harness part number 4987668, manufactured by Cummins, is designed to integrate seamlessly with a variety of Cummins engines. This harness is engineered to ensure reliable electrical connections, facilitating the smooth operation of the engine’s electrical systems.

G855 and G855 CM558

The Wiring Harness 4987668 is compatible with the G855 engine series, including the G855 CM558 variant. This harness is specifically tailored to meet the electrical requirements of these engines, ensuring that all necessary components are properly connected and functioning.

GTA855 CM558 (CM2358) G101

For the GTA855 CM558 (CM2358) G101 engine, the Wiring Harness 4987668 is designed to handle the complex electrical demands of this high-performance engine. The harness is engineered to provide robust and reliable connections, supporting the engine’s advanced features and ensuring optimal performance.

N14 G

The Wiring Harness 4987668 also fits the N14 G engine, providing essential electrical connections that are critical for the engine’s operation. This harness is designed to ensure that all electrical components are properly connected, supporting the engine’s performance and reliability.

By ensuring compatibility with these engines, the Wiring Harness 4987668 plays a role in maintaining the integrity and functionality of the electrical systems within these engines.

Role of Part 4987668 Wiring Harness in Engine Systems

The 4987668 Wiring Harness is an integral component that facilitates the electrical connections within the engine system and ignition system. It serves as the backbone for transmitting electrical signals and power between various engine components, ensuring seamless operation and communication.

In the engine system, the wiring harness connects the engine control unit (ECU) to sensors such as the mass airflow sensor, oxygen sensor, and throttle position sensor. This allows the ECU to receive real-time data on engine performance, enabling it to make precise adjustments to fuel injection, ignition timing, and other parameters. The harness also powers actuators like the fuel injectors and idle air control valve, ensuring they respond accurately to the ECU’s commands.

Within the ignition system, the wiring harness links the ignition coil to the spark plugs and the ECU. It ensures that the ignition coil receives the necessary power to generate a high-voltage spark. This spark is then transmitted to the spark plugs via the harness, igniting the air-fuel mixture in the combustion chambers. The harness also carries signals from the crankshaft position sensor and camshaft position sensor back to the ECU, allowing for precise timing of the ignition events.

Overall, the 4987668 Wiring Harness plays a role in maintaining the electrical integrity and functionality of both the engine system and ignition system, contributing to the overall performance and reliability of the engine ³.

Conclusion

The Cummins 4987668 Wiring Harness is a critical component in the electrical systems of commercial trucks, ensuring reliable and efficient operation of various engine components. Its robust design, compatibility with Cummins engines, and role in maintaining electrical integrity make it an essential part for truck owners and operators. Regular maintenance, proper installation, and adherence to safety precautions are key to maximizing the benefits of this wiring harness.