Ford Focus Mk3 Rear Tail Light Lamp Wiring Plug Socket Left N/S BM51-13405-AK

Ford Focus Mk3 Rear Tail Light Lamp Wiring Plug Socket Left N/S is a precision electrical installation component designed to support the driver-side rear tail light. A properly selected connector ensures a stable electrical connection, reduces the risk of lighting errors, and facilitates system maintenance. By maintaining the factory wiring geometry, the installation remains predictable and organized, which promotes trouble-free operation.

Specifications and technical data

• SKU: 1825321-1
• Mark: Ford
• Condition: Used
• OEM Part Number: 1825321
• Substitutable numbers: 1825321, BM51-13405-AK, BM5113405AK
• Location on the vehicle: Rear, Left
• Part type: Wire Harness
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the vehicle

The presented wiring harness with a socket is dedicated to the rear tail light on the left side of the body in the Ford Focus Mk3 model. The component is responsible for reliable transmission of electrical signals to all rear light circuits, such as position lights, turn signals, or brake lights (depending on the specific lamp configuration in a given vehicle). A properly selected connector minimizes the risk of circuit breaks, lighting flickering, and local contact overheating.

Connector and wiring construction

The plug with a section of the wiring belongs to the Cables, harnesses, and connectors group, which means it has been designed as an intermediary element between the main electrical installation and the lighting module. The construction includes:

• a socket housing matched to the rear tail light on the left side,
• a set of contacts ensuring stable electrical contact,
• a section of wires allowing for connection into the vehicle's factory installation. This solution facilitates the replacement of a damaged section of the installation without the need to interfere with the entire rear wiring harness, which is beneficial both from a technical and economic perspective.

Benefits of using an original Ford wiring harness

The component comes from the Ford line, thanks to which it maintains factory fitment parameters for the lamp and body. Key advantages include:

• Compatible connector geometry – the socket fits the appropriate rear tail light, which reduces the risk of looseness and leaks.
• Appropriate wire length and routing – facilitates routing the harness according to the original path in the vehicle.
• Consistency with the Ford Focus Mk3 electrical installation – no need for modifications, "eyeballing" soldering, or using adapters. Thanks to this, replacing a damaged socket or a section of the wiring allows for restoring the correct operation of the rear lighting without compromising safety and functionality.

Component condition and service application

The offered wiring harness with a socket is a used product, which in practice means it comes from vehicle dismantling and has been verified for suitability for further use. This type of part is particularly useful in situations where:

• mechanical damage to the socket occurred during lamp replacement,
• the installation in the area of the rear tail light has been chafed or overheated,
• a quick and budget-friendly repair of the lighting system is necessary while maintaining the original construction. Using an original wiring harness from dismantling allows for reducing repair time and avoiding problems typical of universal replacements, such as mismatched connectors or unreliable contacts.

Integration with other Ford installation components

Replacing the socket and rear tail light wiring often involves inspecting the entire installation in the rear part of the vehicle. If you are planning a comprehensive repair or upgrade of the rear electrical installation zone in your Ford and need other components from the same group, such as additional wire sections, service connectors, or harness fragments, check out the available parts in the Ford cables, harnesses, and connectors category.

Support in vehicle modernization

While working on the electrical installation, many users also decide to improve comfort inside the car. If you are considering a broader cabin modernization, including replacing seats with more ergonomic ones, it is worth familiarizing yourself with practical tips regarding the selection of components from dismantling – you will find them in the article Interior metamorphosis: how branded seats from dismantling improve comfort and vehicle value.