Mercedes W447 Rear Lamp Plug Wiring Socket Right O/S Tail Light A4478201264

Mercedes W447 Rear Lamp Plug Wiring Socket Right O/S Tail Light is an original lighting system component designed for the right rear lamp in Mercedes W447 series vehicles. It enables a secure electrical connection between the lamp and the vehicle's wiring harness, ensuring stable operation of the position lights, brake lights, and turn signals. Thanks to its factory design, it is a service-friendly solution that enhances the reliability of the lighting system.

Specifications and technical data

• SKU: A4478201264-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A4478201264
• Substitutable numbers: A4478201264, A 447 820 12 64
• Location on the vehicle: Rear, Right
• Part type: Rear Light Assembly
• Category: Rear Light Assemblies

Purpose and function in the lighting system

The presented rear lamp wiring plug is dedicated to installation in the rear right lighting zone of the vehicle. It is responsible for:

• mechanical connection of the lamp to the vehicle's electrical system,
• stable signal transmission for individual lighting functions,
• reducing the risk of contact looseness and circuit interruptions.

Its placement on the rear right side of the vehicle allows for a precise fit to the factory lamp socket without the need for any modifications to the wiring.

Construction and fit for Mercedes W447

The plug has been designed specifically for the geometry of the rear lamp in Mercedes W447 models, which translates into:

• an appropriate body shape and guide rails, facilitating correct insertion into the lamp socket,
• pin arrangement consistent with the factory electrical diagram,
• the ability to be used in the existing wiring harness without additional adapters.

As a result, this component acts as a standard service connector – allowing for efficient lamp replacement or repair of a section of the installation without interfering with the rest of the system.

Benefits of using the original plug

Using a dedicated rear lamp wiring plug in a Mercedes W447 offers a number of practical benefits:

• Compatibility with the factory installation – maintaining the original connector standard minimizes the risk of installation errors.
• Stable rear light operation – proper contacts reduce flickering, light failure, or errors in lighting control systems.
• Easier diagnostics – service technicians have access to a predictable, factory connection point.

This solution is particularly useful for repairs following collisions, connector corrosion, or mechanical damage to the lamp.

Component condition and service application

The offered plug comes from disassembly, which allows for an economical repair of the lighting system while maintaining the manufacturer's original specifications. This type of component is suitable both for replacing a damaged connector and for reconstructing a section of the wiring in the rear part of the vehicle.

Expanding the rear lighting system in Mercedes

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 combination lamps, control modules, or additional wiring harnesses, check out the available parts in the Mercedes rear lights and brake lights category.

For users who want to better understand the relationships between the electrical system and vehicle power supply, an article discussing diagnostics and component selection by catalog numbers may be useful – you can find it here: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.