Mercedes W177 W247 Electrical Wiring Harness Left Right N/O/S A1775408340

The Mercedes W177 / W247 Left-Right Wiring Harness is an original electrical system component designed for Mercedes compact models. It ensures a stable connection between components on the left and right sides of the vehicle, contributing to reliable operation of electrical systems and easier diagnostics. This is the solution for users seeking a factory-fitted component instead of universal replacements.

Specifications and technical data

• SKU: A1775408340
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1775408340
• Substitutable numbers: A1775408340, A 177 540 83 40
• Location on the vehicle: Right, Left
• Category: Wiring Harnesses, Cables & Connectors

Purpose and Function in the Vehicle

The presented wiring harness belongs to the Cables, Harnesses, and Connectors group and has been specifically designed for Mercedes W177 and W247 body types. It is responsible for routing signals and power between elements located on the right and left sides of the vehicle, in accordance with the factory installation architecture.

Its placement in the vehicle covers both sides – left and right – allowing for a cohesive routing of wires in the given body area without the need for multiple different harnesses.

Construction and Fit for Mercedes

As a Mercedes brand component, the harness has been manufactured according to the manufacturer's internal standards regarding wire cross-sections, insulation resistance, and connector quality. This means:

• factory fit to mounting points in the body,
• connectors prepared for original installation sockets,
• wire routing consistent with factory pathways.

This ensures an organized installation process, reducing the risk of wire strain or accidental insulation abrasion.

Condition, Service, and Upgrade Application

The item is in used condition, making it an attractive option for post-accident repairs, replacements after mechanical damage, or restoring system functionality after electrical interventions. It is suitable for both typical service repairs and projects aimed at recreating the original vehicle configuration.

In practice, such a harness is particularly useful when:

• wires on one side of the vehicle have been damaged,
• a section of the electrical system needs replacement after bodywork repairs,
• you want to restore the factory order in the electrical system after previous modifications.

Benefits of Using an Original Harness

Using an original wiring harness in a Mercedes W177 / W247 offers a range of practical benefits:

• Compatibility with Factory Electronics – wires and connectors are designed for specific modules and sensors.
• Stable Electrical Parameters – appropriately selected wire cross-sections and lengths help maintain proper voltage drops.
• Easier Diagnostics – maintaining the original system layout simplifies work with service documentation and schematics.

Expanding the Electrical System in Mercedes – Same Component Group

If you are planning a comprehensive repair or upgrade of the electrical system area in your Mercedes and need other components from the same group, such as additional harnesses, wire sections, or service connectors, check the available parts in the Mercedes Cables, Harnesses, and Connectors category.

More About Using Used Parts in Mercedes

If you are considering a broader upgrade or refurbishment of an older Mercedes using second-hand components, it's worth exploring practical scenarios for such modifications, configuration examples, and common user questions. Useful information can be found in the article Second Life for Youngtimers – How Used Car Parts Revitalize Cars from 1998–2012, which discusses, among other things, the use of used electrical components in premium vehicles.