BO INT REG-13882 BMW OEM
Specifications
- MFR: BOSCH
- FEATURE 1: 100% New
- NOTE 1: Without temperature compensation.
- NOTE 2: Terminal designation: L-15
- SPECS FOR: Bosch IR/IF Alternators
- SPECS: 12 Volt, A-Circuit, 14.3 Vset
Used On
- BMW (2001-2006)
Lester Numbers
13882
Unit Numbers
BMW: 12-31-7-501-595, 12-31-7-501-597, 12-31-7-501-599, 12-31-7-501-690, 12-31-7-501-755
Bosch: 0 124 325 029, 0 124 515 050, 0 124 515 052
Vehicle Application
BMW - China Car
325i 2.5L, M54 256S5, Non-Turbo 2004
BMW - Europe Car
3 (E46) Eng.M52 B25 (256S4) 323 i 125kW M52 B25 (256S4) 1998–2000
3 (E46) Eng.M52 B28 (286S2) 328 i 142kW M52 B28 (286S2) 1998–2000
3 Convertible (E46) Eng.M52 B25 (256S4) 323 Ci 125kW M52 B25 (256S4) 2000
3 Coupe (E46) Eng.M52 B25 (256S4) 323 Ci 125kW M52 B25 (256S4) 1999–2000
3 Coupe (E46) Eng.M52 B28 (286S2) 328 Ci 142kW M52 B28 (286S2) 1999–2000
3 Touring (E46) Eng.M52 B28 (286S2) 328 i 142kW M52 B28 (286S2) 1999–2000
5 (E39) Eng.M52 B20 (206S3) 520 i 110kW M52 B20 (206S3) 1996–2000
5 (E39) Eng.M52 B25 (256S3) 523 i 125kW M52 B25 (256S3) 1996–2000
5 (E39) Eng.M52 B28 (286S1), M52 B28 (286S2) 528 i 142kW M52 B28 (286S1), M52 B28 (286S2) 1996–1997
5 Touring (E39) Eng.M52 B20 (206S3) 520 i 110kW M52 B20 (206S3) 1997–2000
5 Touring (E39) Eng.M52 B25 (256S3) 523 i 125kW M52 B25 (256S3) 1997–1998
5 Touring (E39) Eng.M52 B28 (286S1), M52 B28 (286S2) 528 i 142kW M52 B28 (286S1), M52 B28 (286S2) 1997
7 (E38) Eng.M52 B28 (286S1), M52 B28 (286S2) 728 i, iL 142kW M52 B28 (286S1), M52 B28 (286S2) 1996–2001
Z3 (E36) Eng.M52 B20 (206S4) 2.0 i 110kW M52 B20 (206S4) 1999–2003
BMW Car
320i L6 2.2L 2171cc 132cid 2001–2005
325Ci L6 2.5L 2494cc 152cid 2001–2006
325i L6 2.5L 2494cc 152cid 2001–2005
325xi L6 2.5L 2494cc 152cid 2001–2005
330Ci L6 3.0L 2979cc 2001–2006
330i L6 3.0L 2979cc 2001–2005
330xi L6 3.0L 2979cc 2001–2005
330xi L6 3.0L 2996cc 2006
525i L6 2.5L 2494cc 152cid 2001–2003
530i L6 3.0L 2979cc 2001–2003
Z3 L6 2.5L 2494cc 152cid 2001–2002
Z3 L6 3.0L 2979cc 2001–2002
BMW Truck
X5 L6 3.0L 2979cc 2001–2006
Features & Benefits
- Genuine OEM replacement part
- Manufactured to original factory specifications
- Regulates alternator output voltage
- Helps maintain proper battery charging
- Supports stable charging system performance
- Original fit, function, and electrical characteristics
- Ideal for alternator rebuilding and repair
- Engineered for long-term reliability
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 genuine OEM and premium aftermarket alternator and starter rebuilding components for professional rebuilders, repair shops, automotive technicians, and DIY enthusiasts. Our extensive catalog includes thousands of 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 OEM part number, 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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