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Specifications
- MFR: BOSCH
- FEATURE 1: 100% New
- FEATURE 2: BSS (COM) Regulator
- FEATURE 3: COM ID Code: 20
- NOTE 1: Terminal Identification: BSS-DFM
- SPECS FOR: Bosch IR/IF Alternator
- SPECS: 12 Volt, A-Circuit, 10.7 - 16.0 Vset
Used On
- BMW (2004-2006)
Replaces
BMW: 12 31 7 515 811, XX XX 7 515 811
Bosch: F 00M 145 278, F 00M 145 678, F 00M A45 218
Lester Numbers
11083
Unit Numbers
BMW: 12-31-7-519-721, 12-31-7-519-723, 12-31-7-521-135, 12-31-7-541-694, 12-31-7-541-696, 12-31-7-546-284, 12-31-7-546-285
Bosch: 0 124 525 026, 0 124 525 080, 0 124 525 523
Marelli: 063535250260
Vehicle Application
BMW - China Car
520i 2.2L, M54 226S1, Non-Turbo 2004
525i 2.5L, M54 256S5, Non-Turbo 2004
530i 3.0L, M54 306S3, Non-Turbo 2004
530i 3.0L, N52B30BF, Non-Turbo 2005
BMW - Europe Car
5 (E60) Eng.M54 B22 (226S1) 520 i 125kW M54 B22 (226S1) 2003–2005
5 (E60) Eng.M54 B25 (256S5) 525 i 141kW M54 B25 (256S5) 2003–2010
5 (E60) Eng.M54 B30 (306S3) 530 i 170kW M54 B30 (306S3) 2003–2005
5 Touring (E61) Eng.M54 B25 (256S5) 525 i 141kW M54 B25 (256S5) 2004–2010
7 (E65, E66, E67) Eng.M54 B30 (306S3) 730 i, Li 170kW M54 B30 (306S3) 2003–2005
G15 2200, M54 2003–2005
K15 3000, M54 30 6S 3 2003–2005
Sable 3000, M54 2003–2005
Savana 2500 2500, M54 2003–2010
X3 (E83) Eng.M54 B25 (256S5) 2.5 i 141kW M54 B25 (256S5) 2004–2006
X3 (E83) Eng.M54 B30 (306S3) 3.0 i xDrive 170kW M54 B30 (306S3) 2004–2006
X3 3000, M54 30 6S 3 2004–2006
X3 2500, M54 25 6S 5 2005–2006
BMW Car
325Ci L6 2.5L 2494cc 152cid 2004–2006
325i L6 2.5L 2494cc 152cid 2004–2005
325xi L6 2.5L 2494cc 152cid 2004–2005
330Ci L6 3.0L 2979cc 2004–2006
330Ci L6 3.0L 2979cc M54 Eng 2006
330i L6 3.0L 2979cc 2004–2005
330i L6 3.0L 2996cc N52 2006
330xi L6 3.0L 2979cc 2004–2005
330xi L6 3.0L 2996cc N52 2006
525i L6 2.5L 2494cc 152cid 2004–2005
530i L6 3.0L 2979cc 2004–2005
BMW Truck
X3 L6 2.5L 2494cc 152cid 2004–2006
X3 L6 3.0L 2979cc 2004–2006
Features & Benefits
- Precision aftermarket replacement part
- Regulates alternator output voltage
- Helps maintain proper battery charging
- Supports stable charging system performance
- Manufactured to match original specifications
- Designed for dependable long-term operation
- Ideal for alternator rebuilding and repair
- Cross-referenced to OEM and aftermarket part numbers
What Does a Voltage Regulator Do?
The voltage regulator controls the alternator's output by regulating current supplied to the rotor field winding. As electrical demand changes, the regulator continuously adjusts field current to maintain the proper charging voltage for the battery and the vehicle's electrical system.
A properly functioning voltage regulator helps prevent battery overcharging and undercharging while protecting sensitive electrical components from excessive voltage. Because charging system performance depends on the interaction between the regulator, rotor, stator, rectifier, and battery, replacing a faulty regulator is an important step in restoring alternator performance.
Common Signs Replacement Is Needed
Replace the voltage regulator if you notice:
- Battery overcharging
- Battery not charging
- Low charging voltage
- High charging voltage
- Battery warning light illuminated
- Intermittent charging problems
- Headlights that brighten or dim with engine speed
- Charging system failure during testing
- Voltage regulator failure discovered during alternator rebuilding
Installation Recommendations
Installation should be performed by a qualified technician or experienced alternator rebuilder. Before installing the new regulator, inspect the brushes, brush holder, slip rings, rotor, stator, rectifier, wiring, and electrical connections for signs of wear or damage.
Always verify connector configuration and mounting style before installation. After assembly, bench-test the alternator to confirm proper charging voltage and overall charging system performance.
While You're Rebuilding
Inspect other common wear components to help maximize charging system reliability:
Why Buy From RC Auto Electric?
RC Auto Electric specializes in alternator and starter rebuilding components for professional rebuilders, repair shops, automotive technicians, and DIY enthusiasts. Our extensive catalog includes thousands of OEM and aftermarket electrical components backed by accurate cross-reference information to help simplify part identification and reduce ordering mistakes.
Disclaimer
Compatibility information is provided as a reference only. Manufacturing revisions, production changes, and previous rebuilding modifications may affect internal alternator components. Always compare the original part, connector configuration, mounting style, voltage specifications, cross-reference numbers, and product photographs before installation. If you are unsure about compatibility, contact RC Auto Electric before ordering.
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