Mercedes W205 Battery Cable Starter Wiring Loom Harness M274 Petrol A2055403603

The Mercedes W205 Starter Battery Cable Harness for M274 Gasoline Engines is an original electrical system component, specifically designed for the starting system in vehicles of this series. Thanks to its factory fit to the car's electrical architecture, it ensures stable power supply to the starter and proper connection to the battery, which translates to reliable engine starting. This is a practical service solution for repairs to the engine compartment's electrical system.

Specifications and technical data

• SKU: RHD-A2055403603
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2055403603
• Substitutable numbers: A2055403603, A 205 540 36 03
• Fuel type: Petrol
• Category: Wiring Harnesses, Cables & Connectors

Purpose and Function in the Vehicle

The presented harness belongs to the group of Cables, Harnesses, and Connectors and is responsible for transmitting electrical energy from the battery to the starter in Mercedes C-Class W205 models with the M274 gasoline engine. A correctly selected cable in this area is crucial for:

• ensuring adequate starting current when starting the gasoline engine,
• maintaining stable electrical connections in the engine compartment,
• limiting voltage drops between the battery and the starter.

The original harness is structurally adapted to the wiring layout in the W205 body, which facilitates routing the cable along factory paths and mounting points.

Construction and Technical Features

The starter battery cable harness is designed as a component with appropriate cable cross-section and proper insulation for operation in the engine compartment. The connectors and terminals used are prepared to work with the vehicle's factory connection points, allowing for:

• secure connection to the battery terminal,
• stable attachment to the starter terminal,
• maintaining the correct geometry of the harness relative to other components.

Thanks to this, the cable is resistant to typical operational loads in the engine area, such as vibrations, temperature changes, or contact with other system components.

Application in M274 Gasoline Engines

The component has been developed for the gasoline M274 series engines used in the Mercedes W205. This means it is adapted in terms of both cable length and the placement of mounting points to the specific accessory layout of this engine. In practice, this translates to:

• easier installation without the need for electrical system modifications,
• maintaining the factory routing of the cable,
• proper clearance of the harness from heat-generating components.

For users and workshops, this means predictable, repeatable installation and compliance with the manufacturer's service documentation.

Condition and Benefits of Using an Original Part

The harness is offered as a used part, which represents a reasonable compromise between repair cost and maintaining the original manufacturer's specifications. Choosing a factory starter battery cable helps maintain compliance with the vehicle's electrical system design, thereby reducing the risk of starting problems or improper cable routing.

The use of original components in the starter power supply area is particularly important in modern vehicles, where the electrical system interacts with extensive control electronics and safety systems.

Complementary Components and Additional Information

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional harnesses, power cables, or system connectors, check the available parts in the Mercedes Cables, Harnesses, and Connectors category.

During service work, it is also worth ensuring the condition of systems responsible for driving safety. When selecting used components, especially in critical systems, the following guide may be helpful: Used Braking System: How to Safely Choose Discs, Calipers, and ABS?, which shows what to look for when purchasing parts from the secondary market in a professional automotive store.