Taillight Wiring Mercedes W166 Rear Lamp Right Left N/O/S Harness A1668200113

The Mercedes W166 Rear Lamp Wiring Harness Right Left Beam is an original electrical system component designed to service the rear lamps in Mercedes W166 series vehicles. Thanks to factory-matched connector geometry and appropriately selected wire lengths, the harness ensures a stable electrical connection and proper operation of the lighting on both the right and left sides of the vehicle's rear. This is a practical service solution for users who want to restore full lighting system functionality without experimenting with unreliable aftermarket parts.

Specifications and technical data

• SKU: A1668200113
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1668200113
• Substitutable numbers: A1668200113, A 166 820 01 13
• Location on the vehicle: Rear, Right, Left
• Category: Sockets, Connectors & Wiring

Harness Purpose and Function

The presented harness belongs to the Wires, Plugs, and Connectors group and is responsible for transmitting signals and power to the rear lamps in the W166 body. Its placement on the vehicle covers the rear section of the vehicle on both the right and left sides, allowing for servicing of both lamps with a single, structurally matched harness.

Properly routed wires and factory connectors minimize the risk of voltage drops, interference, and communication issues with lighting control modules. This ensures that the rear light system can operate predictably and in accordance with the vehicle manufacturer's specifications.

Construction and Fit for Mercedes Installations

The harness was designed by Mercedes for integration with the vehicle's original electrical system. The wire layout, type of connectors used, and wiring routing method are adapted to the W166 body architecture, which facilitates installation and reduces the need for modifications.

This solution allows for:

• maintaining the factory wire routing within the rear body section,
• secure connection to the lamps on the right and left sides,
• reducing the risk of mechanical damage and wire chafing during operation.

Usage and Service Characteristics

The item is offered in a used condition, which in practice means it comes from a dismantled vehicle and has been verified for its suitability for further use. For many users, this is an advantageous service solution – it allows for maintaining original manufacturing quality while reducing the cost of lighting system repairs.

The harness is particularly suitable for situations where the factory wiring has been damaged due to corrosion, chafing, improper repairs, or tampering with the system. Using original rear lamp wiring helps restore the correct operation of position lights, brake lights, turn signals, or license plate illumination (depending on vehicle configuration) without the need to build the system from scratch.

Benefits of Using Original Wiring

Choosing a rear lamp harness dedicated to the W166 offers a range of practical advantages:

• factory fit for connectors and body mounts,
• compatibility with the vehicle's existing electrical system,
• reduced risk of installation errors and compatibility issues,
• the ability to restore proper operation of the lighting system on both the right and left sides of the vehicle's rear.

For users who value predictability and compliance with service documentation, using original rear lamp wiring is a more predictable solution than adapting universal wires or unreliable aftermarket parts.

Related Mercedes Electrical System Components

If you are planning a comprehensive repair or upgrade of the rear electrical system area in your Mercedes and need other components from the same group, such as additional harnesses, plugs, or lamp connectors, check the available parts in the Mercedes Wires, Plugs, and Connectors category.

If you are interested in a broader context of using original components in vehicle systems and want to better understand why factory drivetrain elements and their accompanying components are often a better investment than random aftermarket parts, it is worth reading the article: Whining Differential? Find out why a used OEM drive axle is a better investment than an unreliable replacement.