Mercedes W177 Door Harness Loom Cable Wiring Rear Left Right N/O/S A1775402111

Mercedes W177 Left Rear Right Wiring Harness is an original part from the Wires, Harnesses, and Connectors category, designed to service the electrical system in the rear of the body. It ensures factory-standard signal and power routing, contributing to the stable operation of lighting systems and rear axle equipment. This solution is for users who expect consistency with the vehicle's original electrical architecture.

Specifications and technical data

• SKU: A1775402111
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1775402111
• Substitutable numbers: A1775402111, A 177 540 21 11
• Location on the vehicle: Rear, Right, Left
• Category: Wiring Harnesses, Cables & Connectors

Purpose and Vehicle Placement

The presented wiring harness is designed for installation in the rear of the vehicle, servicing both the left and right sides. This setup allows for organized routing of the electrical system within the rear body section, maintaining proper circuit distribution. Its placement in the vehicle has been selected for compatibility with the W177 model's construction, facilitating installation and minimizing the need for modifications.

Technical and Functional Characteristics

The rear wiring harness is responsible for transmitting signals and power to electrical components located at the rear axle and within the side body sections. The connectors used are matched to factory sockets, enabling a near plug-and-play installation without requiring modifications to the existing system.

The arrangement of wires within the harness is optimized for:

• stable signal routing along the rear of the vehicle,
• minimizing the risk of chafing and mechanical damage,
• maintaining the correct connection order on both the left and right sides.

This ensures consistency with the factory service documentation, simplifying diagnostics and any subsequent service work.

Benefits of Using an Original Mercedes Harness

Using a part originating from the Mercedes brand helps maintain compliance with factory safety and quality standards. Appropriate shielding, wire gauges, and connector selection contribute to the correct operation of electrical systems in the rear of the vehicle, including lighting and additional equipment.

Key advantages include:

• Factory Fit for the W177 Body – the harness follows original mounting routes.
• Consistency with Left and Right Side Installations – a single part services both rear sides of the vehicle, simplifying part selection.
• Easier Diagnostics – maintaining the original wiring layout allows for the use of factory electrical schematics.

Condition and Service Application

The offered wiring harness is from the group of used parts, making it an attractive solution for post-accident repairs, mechanical damage to the installation, or restoring functionality after interventions in the rear electrical system. It is particularly useful where wires have been broken, connectors damaged, or incorrect modifications made to the system.

Replacing the complete harness is often more predictable than spot soldering and adding wire sections, as it restores the original installation path and factory connector layout. This is a preferred solution in professional workshops specializing in body and electrical system repairs.

Selection by Numbers and Additional Materials

When selecting a wiring harness for a specific equipment version, it is recommended to verify compatibility by part numbers and vehicle configuration. If in doubt, specialized guides on checking parts by manufacturer numbers and factory markings can be helpful. Practical tips in this regard can be found in the article Risk-Free Online Parts Shopping – 5 Ways to Verify Components by OEM Numbers, which also discusses issues related to selecting parts for Mercedes vehicles.

Other Mercedes Wires, Harnesses, and Connectors

If you also need other electrical system components, such as additional installation sections or connectors for this manufacturer, check the available Mercedes Wires, Harnesses, and Connectors to select components consistent with your car's factory standards.