Mercedes W176 W204 W207 W166 Relay 4 Pin Grey Hella A0025428719

The Mercedes W176 W204 4-Pin Grey Hella Relay is an original part from the relays category, designed for use in Mercedes vehicle electrical systems. This grey, 4-pin relay ensures stable circuit switching, supporting the proper functioning of key electrical and electronic systems.

Specifications and technical data

• SKU: A0025428719
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025428719
• Substitutable numbers: A0025428719, A 002 542 87 19, 4RA007793, 4RA007 793
• Color: Grey
• Category: Relays

Application and Function of the Relay

The presented relay acts as an intermediary between low-current control signals and higher-load circuits, typical for modern Mercedes installations. Its 4-pin design enables reliable switching of circuits on and off, contributing to the stable operation of the vehicle's electrical systems.

This type of solution is used, among other applications, in power circuits for modules, current consumers, and other components where operational repeatability and resistance to engine bay or interior conditions are required.

Construction, Color, and Fitment

The relay housing is finished in a grey color, facilitating visual identification within the fuse box or relay panel. The standard 4-pin configuration allows for correct insertion into the socket designated for this type of component, without the need for installation modifications.

As a Mercedes-branded part, manufactured by Hella, this relay is designed for precise fitment with the factory installation. Selecting the correct parts from the relays category minimizes the risk of installation errors and electrical compatibility issues.

Part Condition and Benefits of Use

This part is offered as used, presenting an attractive option for users seeking an economical alternative to new components while maintaining the original manufacturer's specifications. A correctly chosen relay helps restore proper functionality to systems exhibiting symptoms such as unstable power supply, intermittent function loss, or problems with activating consumers.

Key benefits of using an original relay include:

• maintaining operating parameters consistent with the original Mercedes installation design,
• reducing the risk of electrical system malfunctions after replacement,
• direct installation in place of the worn-out component.

Selection and Role of Reference Numbers

The relay has a dedicated OEM part number and associated cross-reference numbers, which simplifies its identification in catalogs and service systems. In practice, this means that when selecting a component for a specific Mercedes model, you can use either the original number or the reference numbers to verify compatibility with the particular body style and equipment version.

If you have doubts when selecting parts from the relays category, it is advisable to compare the markings on the old part with the data in the product's technical specifications and the vehicle's documentation. This minimizes the risk of installing an incorrect component and the associated diagnostic problems.

Practical Installation and Operational Tips

When replacing the relay, it is recommended to:

• disconnect the vehicle's power supply before removing the old component,
• check the condition of the socket and contacts for corrosion or overheating,
• securely insert the new relay into the socket without excessive force,
• verify the operation of the controlled circuit after installation.

This approach ensures trouble-free operation of electrical systems and reduces the risk of recurring faults due to loose connections or damaged contacts.

Summary

The Mercedes W176 W204 4-Pin Grey Hella Relay is a functional, original electrical system component designed for use in select Mercedes models. Its grey housing, 4-pin construction, and compliance with factory manufacturer standards make it a sensible choice for repairs and diagnostics of electrical systems, especially where precise fitment and predictable operating parameters are crucial.