Mercedes W213 C238 Battery Terminal Positive Cable Wiring OM656 A2135407173

Mercedes W213 C238 Battery Terminal Positive Cable Wiring OM656 is an original electrical system component designed for diesel-powered vehicles. It ensures a stable connection between the positive battery terminal and the vehicle's electrical system, which is crucial for starting the diesel engine and powering onboard systems. As part of the Battery Accessories group, it provides a precise service solution for the latest generation of Mercedes E-Class and E-Class Coupé models.

Specifications and technical data

• SKU: RHD-A2135407173
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2135407173
• Substitutable numbers: A2135407173, A 213 540 71 73
• Fuel type: Diesel
• Category: Battery Accessories

Purpose and compatibility with diesel engines

The presented positive cable is designed to work with the OM656 power unit, which is a modern Mercedes diesel engine. In such designs, requirements regarding the stability of the starter and engine control unit power supply are particularly high, which is why the proper condition of the positive cable has a direct impact on reliable starting and the correct operation of injection systems and control units.

This component is part of the factory vehicle power system and has been developed specifically for the current loads typical of diesel engines, which reduces voltage drops and the risk of connection overheating.

Construction and function of the positive battery cable

The positive battery cable in this Mercedes model performs several important functions in the vehicle's electrical system:

• transfers high starting current from the battery to the starter and the main power bus,
• ensures low connection resistance, which improves the efficiency of the starting system,
• stabilizes power supply for control modules and high-energy consumers,
• limits the risk of local overheating thanks to a properly selected cross-section and terminal design.

Thanks to the factory fit for W213 and C238 bodies, the cable is routed according to the original installation path, which facilitates service and allows for safe wiring harness routing in the engine compartment.

Application in the power system and benefits of replacement

In vehicles with a diesel engine, even a slight deterioration in the quality of the positive connection can result in starting problems, control unit errors, or unstable operation of comfort systems. Replacing the positive cable with an original element from the Battery Accessories group allows you to:

• reduce voltage drops during startup,
• improve engine starting reliability in low temperatures,
• stabilize power supply for onboard electronics,
• restore factory parameters of the electrical system.

This solution is especially recommended in the event of signs of terminal overheating, contact oxidation, or mechanical damage to the harness.

Characteristics of the original Mercedes component

The offered positive battery cable comes from the vehicle manufacturer's range, which means a perfect fit for the specific body and engine configuration. Original Mercedes Battery Accessories are designed taking into account current loads, temperature conditions in the engine compartment, and fire safety requirements. As a result, the user receives a component consistent with factory quality and compatibility standards.

The used condition allows for an economical repair while maintaining the correct cable routing geometry and original mounting points, which is important for both safety and ease of installation.

Support with selection and additional materials

If you are planning a comprehensive repair or upgrade of the power and starting area in your Mercedes and need other components from the same group, such as ground cables, battery terminals, or additional power harnesses, check the available parts in the Mercedes Battery Accessories category.

For drivers interested in a broader approach to comfort and power system service, a guide on selecting used OEM components and maintenance schedules may be useful – you can find it in the article Air conditioning and heating – part selection and maintenance for year-round comfort, which discusses practical aspects of operation and system service in modern cars.