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Aftermarket Voltage Regulator M523

Brand: Valeo

SKU: M523

availability: Out of stock

Product Code: Voltage Regulator

$60.00

Quantity

Quantity must be 1 or more

Shipping

In-stock orders ship out same day or next business day via USPS.

Pre Order

Pre-orders ship out in the order received within 7–21 business days.

Customer Support

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Description

Description

Specifications

MFR:VALEO
FEATURE 1:100% New
FEATURE 2:Stator activated
FEATURE 3:OE compliant soft start
FEATURE 4:Shorted field, lamp & choke protection
SPECS FOR:Valeo IR/IF Alternators
SPECS:12 Volt, B-Circuit, 61E-15 (Lamp-Ignition) Terminals, 14.3 Vset, 5 sec. LRC

USED ON

BMW (1999-2006)

LESTER NUMBERS

11098, 13970, 13971, 13974, 23076

Replaces

BMW 12-31-7-501-749, 12-31-7-551-153, Valeo 2542378B, 2543325B, 2543327B, 593423, 593839, YM3699

Vehicle Application

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
525i L6 2.5L 2494cc 152cid 2001-2003
530i L6 3.0L 2979cc 2001-2003
M3 L6 3.2L 3246cc 2002-2006
Z3 L6 2.5L 2494cc 152cid 2001-2002
Z3 L6 3.0L 2979cc 2001-2002
Z3 L6 3.2L 3246cc 2001-2002

BMW Truck
X5 L6 3.0L 2979cc 2001-2006

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 (E46) Eng.M54 B22 (226S1) 320 i 125kW M54 B22 (226S1) 2000-2005
3 Convertible (E46) Eng.M52 B25 (256S4) 323 Ci 125kW M52 B25 (256S4) 2000
3 Convertible (E46) Eng.M54 B22 (226S1) 320 Ci 120kW M54 B22 (226S1) 2006-2007
3 Convertible (E46) Eng.M54 B22 (226S1) 320 Ci 125kW M54 B22 (226S1) 2000-2007
3 Convertible (E46) Eng.S54 B32 (326S4) M3 3.2 252kW S54 B32 (326S4) 2001-2007
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 Coupe (E46) Eng.M54 B22 (226S1) 320 Ci 125kW M54 B22 (226S1) 2000-2006
3 Coupe (E46) Eng.S54 B32 (326S4) M3 252kW S54 B32 (326S4) 2000-2006
3 Coupe (E46) Eng.S54 B32, S54N 326 S4 M3 265kW S54 B32, S54N 326 S4 2003-2004
3 Touring (E46) Eng.M52 B28 (286S2) 328 i 142kW M52 B28 (286S2) 1999-2000
3 Touring (E46) Eng.M54 B22 (226S1) 320 i 125kW M54 B22 (226S1) 2000-2005
320 2000, M52B 1998-2001
320 2200, M54 2000-2005
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) 1996-2000
5 (E39) Eng.M57 D25 (256D1) 525 d 120kW M57 D25 (256D1) 2000-2003
5 (E39) Eng.M57 D30 (306D1) 530 d 135kW M57 D30 (306D1) 1998-2000
5 (E39) Eng.M57 D30 (306D1) 530 d 142kW M57 D30 (306D1) 2000-2003
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) 1997-2000
5 Touring (E39) Eng.M57 D25 (256D1) 525 d 120kW M57 D25 (256D1) 2000-2004
5 Touring (E39) Eng.M57 D30 (306D1) 530 d 135kW M57 D30 (306D1) 1998-2000
5 Touring (E39) Eng.M57 D30 (306D1) 530 d 142kW M57 D30 (306D1) 2000-2004
7 (E38) Eng.M52 B28 (286S1), M52 B28 (286S2) 728 i, iL 142kW M52 B28 (286S1), M52 B28 (286S2) 1996-2001
G15 2000, M52B20 1995-2000
G25 2500, M52B 1995-2000
K15 2900, M57 1998-2004
M3 3246, S54B32 2000-2007
Mountaineer 2800, M52 1996-2002
Ramcharger 2500, M52B 1998-2000
Savana 2500 2500, M57 2000-2004
Savana 3500 2800, M52 1996-2000
Spirit 2800, M52 1998-2000
X5 3000, M57 2001-2003
X5 (E53) Eng.M54 B30 (306S3) 3.0 i 170kW M54 B30 (306S3) 2000-2006
X5 (E53) Eng.M57 D30 (306D1) 3.0 d 135kW M57 D30 (306D1) 2001-2003
Z3 2000 1999-2000
Z3 2800 1997-2003
Z3 3246, S54B32 2001-2003
Z3 (E36) Eng.M43 B18 (184E2) 1.8 i 85kW M43 B18 (184E2) 1995-1998
Z3 (E36) Eng.M52 B20 (206S4) 2.0 i 110kW M52 B20 (206S4) 1999-2003
Z3 (E36) Eng.M52 B28 (286S1) 2.8 i 141kW M52 B28 (286S1) 1997-2000
Z3 (E36) Eng.M52 B28 TU 2.8 i 143kW M52 B28 TU 1996-2000
Z3 (E36) Eng.S54 B32 (326S4) M 3.2 239kW S54 B32 (326S4) 2001-2003
Z3 Coupe (E36) Eng.M52 B28 (286S1) 2.8 i 141kW M52 B28 (286S1) 1997-2000
Z3 Coupe (E36) Eng.S54 B32 (326S4) M 239kW S54 B32 (326S4) 2001-2003

Land Rover - Europe Truck
Range Rover III 3000, M57-D30 2002-2010

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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