12V 170A Replacement Alternator for BMW 320i 328i and X3 2.0L L4

1. Vehicle Fitment and OE Identification

The KU-FV-03-002 is a new replacement alternator developed for compatible BMW models equipped with a 2.0 L inline-four engine. Its mounting arrangement, electrical connections and pulley configuration are designed for direct installation in the listed vehicle applications.

• BMW 320i 2.0 L L4
• BMW 328i 2.0 L L4
• BMW X3 2.0 L L4
• OE Reference: 104210-6393
• OE Reference: 12-31-7-605-478
• OE Reference: 7605478-03

Vehicle compatibility should be checked using the OE reference number, engine configuration and original alternator specifications before ordering.

2. 170 A Charging Output

The alternator supplies up to 170 A of charging current to support the vehicle battery and onboard electrical systems. Its regulated output helps maintain consistent power delivery when lighting, climate control, infotainment and other electrical equipment operate simultaneously.

• 170 A Rated Current: Supports the electrical requirements of the listed vehicle applications.
• 12 V Charging System: Designed for the specified BMW electrical architecture.
• Stable Voltage Output: Helps maintain dependable power across the onboard electrical network.
• High-Load Operation: Supports multiple compatible electrical systems operating simultaneously.
• Efficient Power Generation: Helps restore charging performance when replacing an aged or faulty alternator.

3. Internal Regulation and Cooling

A BSS voltage-control system regulates charging output according to vehicle operating conditions. The integrated regulator and internal fan create a compact assembly while helping control temperatures generated during high-load operation.

• BSS Regulation: Controls alternator output according to the vehicle’s charging requirements.
• Internal Regulator: Reduces the need for an externally mounted regulation component.
• Internal Cooling Fan: Circulates air through the alternator housing to dissipate operating heat.
• Compact Construction: Combines charging and cooling components within a space-efficient housing.
• Thermal Management: Helps maintain stable output during prolonged vehicle operation.

4. Pulley and Installation Configuration

The alternator features a clockwise rotation direction and a 6-groove overrunning clutch pulley. Its mounting points and connection layout are designed to correspond with the specified original installation arrangement.

• 6-Groove Clutch Pulley: Matches the specified accessory-belt configuration.
• Clockwise Rotation: Corresponds with the required drive direction.
• Direct Replacement Layout: Supports installation without modifying the original mounting position.
• Vehicle-Specific Connections: Designed to connect with the corresponding vehicle electrical system.
• Compact Housing: Fits within the designated engine-compartment installation area.

5. Installation Requirements

• Disconnect the negative battery terminal before beginning installation.
• Confirm the OE number, connector type, pulley and mounting points before fitting the alternator.
• Adjust the drive-belt tension according to the vehicle service requirements.
• Avoid insufficient belt tension, which may cause slipping and reduced charging output.
• Avoid excessive belt tension, which may accelerate belt and bearing wear.
• Tighten all mounting fasteners securely before operating the vehicle.
• Test the charging voltage and electrical connections after installation.