Mercedes W204 Battery Wiring Cable Harness Loom Rear A2045403510

Mercedes W204 Battery Wiring Cable Harness Loom Rear is a specialized electrical system component, responsible for a safe and stable connection between the battery and the vehicle's systems in the rear part of the body. This solution is designed for users who expect reliable energy transmission, correct electrical communication, and compatibility with the factory installation architecture in Mercedes models. By maintaining the original cable routing geometry, the harness supports seamless integration with existing wiring.

Specifications and technical data

• SKU: A2045403510
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045403510
• Substitutable numbers: A2045403510, A 204 540 35 10
• Location on the vehicle: Rear
• Category: Wiring Harnesses, Cables & Connectors

Purpose and vehicle placement

The presented harness belongs to the Wires, harnesses, and connectors group and is intended for installation in the rear part of the vehicle. Placement in the rear area allows for proper routing of power from the battery to further installation elements, while maintaining the appropriate mounting paths and attachment points provided by the manufacturer.

This solution is particularly important in vehicles where the battery is located in the rear part of the body – a properly selected harness reduces voltage drops, minimizes the risk of mechanical damage to the wires, and supports the stable operation of electrical systems.

Technical and functional characteristics

The battery wiring harness has been designed as a component dedicated to a specific Mercedes platform, which translates into:

• appropriately selected length and routing of wires in the rear part of the vehicle,
• use of connectors matched to factory connection points,
• compatibility with original installation holders and guides,
• maintenance of the correct wire cross-section for loads typical of battery circuits.

Such a design promotes the consistency of the entire electrical system and also facilitates diagnostics and any future service work.

Component condition and benefits of use

The offered harness is an aftermarket component, which allows for an economical replacement of damaged or corroded wiring while maintaining compliance with Mercedes factory solutions. Choosing an original used harness instead of universal replacements reduces the risk of problems with wire length, connector type, or cable routing.

Key benefits of using this component include:

• factory fit to the electrical architecture of a specific vehicle generation,
• maintenance of the correct order and logic of connections in the battery circuit,
• reduction of the need for installation modifications during assembly,
• possibility of restoring the correct operation of systems powered from the rear of the vehicle.

Application in service and installation modernization

The battery wiring harness in the rear of the vehicle is often replaced in situations where mechanical damage, insulation overheating, connector corrosion, or interference with the installation during previous repairs occurs. Using a dedicated component allows for restoring the correct cable routing and proper protection of connections, which has a direct impact on starting reliability and power stability.

In workshop practice, such a component works well both for standard replacement of a damaged harness and for more extensive work related to the reconstruction of the installation in the rear part of the body.

If you are planning a comprehensive repair or modernization of the electrical installation area in the rear of your Mercedes and need other elements from the same group, such as power cables, signal harnesses, or mounting connectors, check the available parts in the Mercedes Wires, harnesses, and connectors category.

Ecological and economic aspect

Choosing a used battery wiring harness is not only a saving but also a real contribution to reducing the amount of production waste in the automotive industry. Reusing functional electrical system components reduces the demand for new raw materials and the energy needed to manufacture parts.

If you want to learn more about the benefits of installing aftermarket components and the impact of such decisions on the environment and the vehicle's operating budget, it is worth reading the article Eco-driving: discover the benefits of used car parts.