Metzger

Metzger Generator Regulator 2390057

The Metzger Generator Regulator 2390057 is a high‑performance component designed to maintain optimal voltage output from the alternator in a wide range of BMW models. Its precision engineering ensures that the electrical system receives a stable supply, protecting sensitive electronics and extending battery life.

Key Features & Technical Specifications

• Voltage Regulation: Maintains output between 13.5 V and 14.8 V across varying engine speeds.
• Current Capacity: Supports up to 120 A, suitable for modern BMW power demands.
• Compact Design: Fits the original mounting space without modification.
• Durable Construction: Made from high‑grade aluminum alloy with corrosion‑resistant coating.
• Temperature Tolerance: Operates reliably up to 120 °C, ensuring performance in hot climates.

Compatibility Overview

The regulator is engineered for a broad spectrum of BMW models, including but not limited to:

• BMW 3‑Series (E46, E90)
• BMW 5‑Series (E39, E53)
• BMW X5 (E53)
• BMW Z3
• Other variants that share the same alternator architecture.

Its universal fitment eliminates the need for custom adapters or extensive rework. The part number 2390057 is recognized across all official BMW service documentation, guaranteeing seamless integration.

Installation Guide

1. Disconnect the battery: Ensure safety by removing the negative terminal before work begins.
2. Remove the existing regulator: Unscrew the mounting bolts and detach electrical connectors carefully.
3. Position the new regulator: Align with the original mounting holes, ensuring proper orientation of the wiring terminals.
4. Screw in place: Tighten bolts to manufacturer specifications (typically 20 Nm).
5. Reconnect battery and test: Verify correct voltage output using a multimeter; adjust if necessary per BMW service manual.

Performance Benefits

• Enhanced Electrical Stability: Reduces voltage spikes that can damage infotainment systems, navigation units, and other electronic modules.
• Improved Battery Longevity: Consistent charging prevents over‑charging or under‑charging scenarios, extending battery life.
• Reduced Maintenance Costs: Reliable regulation lowers the likelihood of alternator failure and associated repairs.

Maintenance & Troubleshooting

Regular inspection is recommended to ensure optimal operation. Look for signs such as:

• Visible corrosion on terminals or mounting points.
• Unusual heat buildup around the regulator housing.
• Voltage irregularities detected during routine checks.

If issues arise, consult the BMW service manual for diagnostic procedures. Replacement of the regulator is typically straightforward and can be performed in a standard workshop environment.

Why Choose Metzger?

• Reputation: Metzger has a long history of producing high‑quality automotive electrical components for premium brands.
• Precision Engineering: Each regulator undergoes rigorous testing to meet BMW’s stringent performance criteria.
• Compatibility Assurance: The part number 2390057 guarantees a perfect fit across multiple model years and trims.

Conclusion

The Metzger Generator Regulator 2390057 delivers reliable voltage regulation, ensuring that your BMW’s electrical system operates at peak efficiency. Its robust construction, wide compatibility range, and straightforward installation make it an essential upgrade for owners seeking longevity and performance in their vehicle’s powertrain.