Mercedes W164 Battery Starter Alternator Wiring Harness Cable OM642 A1645401730

Mercedes W164 Battery Starter Alternator Wiring Harness Cable is a specialized component from the Cables, harnesses and connectors category, designed for the starting and charging system in diesel-powered vehicles. It is responsible for a stable, secure electrical connection between the starter, alternator, and the vehicle's electrical system, which is crucial for reliable starting of the diesel engine. This solution is dedicated to the Mercedes W164 design, engineered to meet the requirements of the factory electrical installation.

Specifications and technical data

• SKU: A1645401730
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1645401730
• Substitutable numbers: A1645401730, A 164 540 17 30, BG
• Fuel type: Diesel
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the electrical system

The described harness is a component responsible for transmitting high starting currents and powering the alternator in diesel vehicles. In practice, this means that it:

• ensures sufficiently low resistance of the current path between the battery, starter, and alternator,
• stabilizes the operation of the charging system through proper routing of power cables,
• reduces the risk of voltage drops, overheating of connectors, and unreliable engine starting.

Thanks to its fitment for the Mercedes W164 electrical architecture, the harness works with factory mounting points and original connectors, which facilitates installation and servicing.

Construction and fitment for Mercedes W164

The harness has been designed with the specific routing of cables in the engine bay of this model in mind, taking into account the thermal and mechanical loads typical for diesel units. The construction includes:

• cables with cross-sections selected for the starting currents characteristic of diesel engines,
• connectors adapted for use with the starter and alternator used in the Mercedes W164,
• appropriate branches and connection points for the vehicle's installation.

Such a solution allows for maintaining consistency with the factory electrical diagram, which is important for diagnostics, voltage measurements, and any potential future repairs.

Benefits of using a dedicated harness

Using a harness intended for a specific vehicle platform brings measurable operational and service benefits:

• Stable operation of the starting system – properly selected cable cross-sections and correct installation routing promote reliable diesel engine starting, even under higher electrical loads.
• Secure electrical connections – dedicated connectors reduce the risk of sparking, contact looseness, and local overheating, which is particularly important in high-current areas.
• Easier diagnostics – maintaining the original geometry of the harness makes it easier to locate cables based on service diagrams and perform control measurements.
• Consistency with the factory installation – no need for modifications, soldering, or creating additional cable sections reduces the risk of future failures.

Operational characteristics and installation

The item comes from a vehicle, which means it is a used part that retains its factory geometry and operating characteristics. In practice, this translates into:

• the possibility of installation in place of the original harness without interfering with the vehicle's structure,
• maintaining compatibility with the electrical system adapted for diesel fuel,
• no need to adapt universal cables or connectors.

Before installation, it is recommended to perform a standard inspection of the insulation, connectors, and mounting points, in accordance with service procedures for diesel installations in Mercedes vehicles.

System expansion and related parts

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

For users interested in deepening their knowledge about selecting components for turbocharging and air cooling systems in modern units, the Global Parts guide may be useful – BMW B58 Code – checklist before buying a turbocharger and intercooler for the BMW 3 Series (G20), which discusses issues of compatibility, OEM markings, and VIN-based part verification in an accessible way.