Mercedes-Benz A B W169 W245 Starter Alternator Wiring Loom Harness A1694403805

Mercedes-Benz A B W169 W245 Starter Alternator Wiring Loom Harness is an original electrical system component designed for the precise connection of the alternator and starter in Mercedes compact class vehicles. This used, factory-spec wiring harness ensures proper routing of starting and charging current while maintaining compatibility with the vehicle's original electrical architecture. It is a practical solution for workshops and users who want to restore the correct operation of the starting system without using random aftermarket replacements.

Specifications and technical data

• SKU: A1694403805
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1694403805
• Substitutable numbers: A1694403805, A 169 440 38 05, A1694403005, A 169 440 30 05
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the vehicle

The described wiring harness belongs to the Wires, harnesses and connectors group and is responsible for a stable, low-resistance connection between the alternator and starter and the rest of the electrical system. A correctly selected component of this type:

• ensures proper flow of starting current to the engine,
• enables efficient battery charging by the alternator,
• minimizes voltage drops and the risk of wire overheating,
• maintains the factory routing of the harness in the engine bay.

By maintaining the original geometry of the wires and the correct selection of cross-sections, the harness supports the stable operation of the electrical system in daily use.

Benefits of using an original Mercedes wiring harness

Choosing an original alternator and starter wiring harness for W169 and W245 models provides a number of practical assembly and operational benefits:

• Factory fitment – wire lengths, connector placement, and mounting points are consistent with the manufacturer's design, which facilitates installation.
• Consistency with the vehicle's installation – the harness works with existing brackets, covers, and ground points in the engine bay.
• Reduction of electrical fault risks – the use of wires with the appropriate cross-section and insulation reduces the risk of overheating and local voltage drops.
• Seamless integration with other starting and charging system components – no need for modifications or soldering additional wire sections.

Operational characteristics and installation

The used version of the alternator and starter wiring harness is a good choice in situations where a reasonable repair cost is important while maintaining the original system design. This type of component is particularly useful in:

• repairs following mechanical or thermal damage to wires in the engine bay,
• restoring the factory condition of the installation after previous unprofessional modifications,
• servicing vehicles used intensively, where starting reliability is crucial.

Due to the factory design, installation is orderly – the wires are routed according to the original paths, which facilitates subsequent diagnostics and service.

Condition and use in service practice

A used component from the Wires, harnesses and connectors group allows for an economical repair without sacrificing factory build quality. This solution is often chosen by professional workshops that prefer original dismantled components over unreliable replacements. A properly selected alternator and starter wiring harness helps eliminate typical symptoms of power supply problems, such as difficult starting or unstable battery charging.

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 power cables, control harnesses, or installation connectors, check the available parts in the Mercedes Wires, harnesses and connectors category.

For users interested in a broader approach to servicing premium cars using proven dismantled components, the article describing strategies for reducing maintenance costs of luxury vehicles may be helpful – more information can be found in the material Luxury within reach – how to service a Porsche legend using proven used parts.