Mercedes ML W166 Rear Tail Light Lamp Wiring Harness Cable Left N/S A1669063301

Mercedes ML W166 Rear Tail Light Lamp Wiring Harness Cable Left N/S is an original electrical system component designed to support the rear lighting on the driver's side. Thanks to its factory-fit for the ML W166 body, it ensures a stable electrical connection and proper operation of the tail light in demanding operating conditions. It is a practical solution for post-collision repairs, lamp replacement, or damage to the factory wiring harness.

Specifications and technical data

• SKU: A1669063301-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1669063301
• Substitutable numbers: A1669063301, A 166 906 33 01
• Location on the vehicle: Rear, Left
• Part type: Wire Harness
• Category: Wiring Harnesses, Cables & Connectors

Purpose and placement in the vehicle

The presented wiring harness with plug is intended for installation in the rear part of the vehicle, on the left side. It is responsible for the electrical connection between the tail light and the vehicle's wiring system, which is crucial for the operation of position lights, brake lights, turn signals, or license plate lighting – in accordance with the configuration used in a given ML W166 unit.

The component belongs to the Wires, harnesses, and connectors group, which means it has been designed for safe routing of electrical signals and mechanical protection of wires against abrasion and loose connections.

Use in service and rear electrical repairs

The tail light wiring harness with plug on the left side is particularly useful in situations where:

• the factory connector at the lamp has been damaged (cracking, melting, contact corrosion),
• the tail light installation was previously repaired in a makeshift manner and requires restoration to a factory-like state,
• after replacing or upgrading the lamp, it is necessary to match the original wiring harness to the ML W166 body.

Using an original wiring harness from this product group allows for reducing the risk of installation errors, such as unstable connections, flickering lights, or lighting failure messages on the instrument cluster.

Benefits of using an original Mercedes wiring harness

Selecting a component dedicated to a specific vehicle model brings measurable assembly and operational benefits. In the case of this wiring harness, you can count on:

• factory fit for the tail light and body – the correct connector geometry and wire length facilitate installation without modifications,
• consistency with the original Mercedes electrical system – maintaining proper wire routing and mounting points,
• reduction of diagnostic problems related to incorrect circuit resistance or unstable contact.

For the user, this means more predictable rear lighting operation and a lower risk of recurring faults related to electrical connections.

Product characteristics and condition

The tail light wiring harness with plug on the left side comes from the Mercedes brand, which confirms its structural compatibility with the ML W166 platform. The product is classified as used, which in practice means it has been removed from a vehicle and may show signs of previous use, while maintaining the functionality required for further operation.

Such a solution is particularly beneficial for vehicle repairs where maintaining the original installation architecture and optimizing service costs compared to purchasing new components is important.

Support with selection and related items

If you are planning a comprehensive repair or upgrade of the rear lighting zone in your Mercedes and need other components from the same group, such as additional harnesses, connectors, or wire sections, check the available parts in the Mercedes wires, harnesses, and connectors category.

For drivers interested in a broader vehicle upgrade – for example, during electrical system repairs, lamp replacements, or work on the rear body panel – a practical guide on the operation and purchase of drivetrain components, available in the article Transmission: manual, automatic, or DSG – typical faults and a guide to buying a used transmission, may also be helpful.