Aftermarket Bosch Voltage Regulator IB387

Specifications

• MFR: BOSCH
• FEATURE 1: 100% New
• FEATURE 2: Hermetically sealed circuit
• SPECS FOR: Bosch IR/IF Alternators
• SPECS: 12 Volt, A-Circuit, 14.5 Vset, 180 ohm Resistor

Used On

• Mercedes-Benz (1987-2004)

Replaces

Audi, Volkswagen: 00A-903-803, 00A-903-803A
Bosch: 1 197 311 211, 1 197 311 213, 1 197 311 217, 1 197 311 219, 1 197 311 242, 1 197 311 533, 1 197 311 541, 1 197 311 556
Lucas: 2131041, UCB419
Marelli: 940038016
Mercedes-Benz: 002-154-81-06, 002-154-82-06, 002-154-85-06, 002-154-87-06, 002-154-92-06, 002-215-91-06, 003-154-06-06
Niehoff: WA7029
PSA Peugeot Citroen: 576185, 95644488, 95644494
Saab: 47 37 151
Scania: 4409983, 4466918
Volvo: 3544570-9

Lester Numbers

12383, 12676, 12677, 13356, 13359, 13376, 13422, 13520, 13610, 13613, 13631, 13710, 13779, 13792, 13793, 13797, 13798, 13803, 13811, 13818, 13819, 13855, 13972, 20640, 22606, 22636, 22879, 22886, 22900, 22902, 23020

Unit Numbers

Audi, Volkswagen: 00A-903-025A, 028-903-026J
Bosch: 0 120 465 003, 0 120 465 004, 0 120 465 012, 0 120 465 013, 0 120 465 014, 0 120 465 015, 0 120 465 016, 0 120 465 017, 0 120 465 018, 0 120 465 029, 0 120 485 011, 0 120 485 012, 0 120 485 022, 0 123 310 005, 0 123 315 005, 0 123 320 010, 0 123 320 011, 0 123 320 029, 0 123 320 035, 0 123 320 039, 0 123 320 041, 0 123 320 044, 0 123 320 045, 0 123 320 046, 0 123 320 047, 0 123 320 049, 0 123 320 051, 0 123 320 058, 0 123 320 061, 0 123 320 062, 0 123 320 065, 0 123 335 002, 0 123 335 003, 0 123 335 004, 0 123 335 005, 0 123 335 006, 0 123 335 008, 0 123 340 006, 0 123 500 001, 0 123 500 002, 0 123 505 017, 0 123 510 002, 0 123 510 004, 0 123 510 012, 0 123 510 016, 0 123 510 018, 0 123 510 021, 0 123 510 021, 0 123 510 022, 0 123 510 023, 0 123 510 038, 0 123 510 039, 0 123 510 040, 0 123 510 044, 0 123 510 049, 0 123 510 050, 0 123 510 051, 0 123 510 057, 0 123 510 058, 0 123 510 059, 0 123 510 066, 0 123 510 067, 0 123 510 068, 0 123 510 072, 0 123 510 075, 0 123 510 079, 0 123 510 080, 0 123 510 081, 0 123 510 082, 0 123 510 100, 0 123 510 101, 0 123 510 102, 0 123 510 107, 0 123 510 108, 0 123 520 006, 0 123 520 007, 0 123 520 008, 0 123 520 010, 0 123 520 011, 0 123 520 012, 0 123 520 013, 0 123 520 017, 0 123 520 023, 0 123 520 031, 0 123 540 002, 0 123 540 003, 0 123 540 004, 0 123 545 004, 9 123 320 045, 9 123 335 002, 9 123 369 044, 9 123 510 068, 9 123 520 017
Chrysler: 5128137AA, 5128138AA
DAF: 1516409R, 1516410R, 1516430R, 1516438R, 1516443R, 1516445R, 1516446R, 1516475R, 1516476R, 1516505R, 1524010R, 1524010R
Letrika (Iskra) Tech.: AAK5127, AAK5127, AAK5127, AAK5127, AAK5306, AAK5306, AAK5306, AAK5306, AAK5307, AAK5308, AAK5309, AAK5309, AAK5312, AAK5312, AAK5313, AAK5319, AAK5322, AAN5304, AAN5304, AAN5305, AAN5305, AAN5305, AAN5305, AAN5305, AAN5306, AAN5306, AAN5306, AAN5307, AAN5307, AAN5307, AAN5307, AAN5309, AAN5309, AAN5312, AAN5350, AAN5350, AAN5350, AAN5350, AAN5572
Magneton: 9-515-624, 9-515-624
Marelli: 063533200460, 063535200170, 943355090010, 943355128010, 943355135010, 944390368200, 944390381600, 944390394200, 944390401800, 944390415900
Mercedes-Benz: 008 154 72 02, 008 154 73 02, 008-154-51-02, 008-154-52-02, 008-154-71-02, 008-154-73-02, 008-154-74-02, 008-154-74-02-88, 008-154-82-02, 008-154-83-02, 008-154-84-02, 008-154-84-02-88, 008-154-92-02, 008-154-92-02-88, 008-154-96-02, 008-154-97-02, 008154960280, 009 154 30 02, 009 154 30 02 80, 009 154 30 02 80, 009 154 35 02 80, 009 154 56 02, 009-154-01-02, 009-154-02-02, 009-154-12-02, 009-154-13-02, 009-154-17-02, 009-154-19-02, 009-154-29-02, 009-154-30-02, 009-154-31-02, 009-154-35-02, 009-154-36-02, 009-154-37-02, 009-154-42-02, 009-154-43-02, 009-154-51-02, 009-154-60-02, 009-154-67-02, 009-154-76-02, 009-154-88-02, 009-154-93-02, 009154300280, 009154300280, 010 154 08 02 80, 010 154 78 02, 010-154-01-02, 010-154-02-02, 010-154-03-02, 010-154-04-02, 010-154-05-02, 010-154-06-02, 010-154-07-02, 010-154-08-02, 010-154-10-02, 010-154-12-02, 010-154-16-02, 010-154-29-02, 010-154-32-02, 010-154-40-02, 010-154-40-02, 010-154-46-02, 010-154-47-02, 010-154-48-02, 010-154-49-02, 010-154-51-02, 010-154-52-02, 010-154-59-02, 010-154-63-02, 010-154-64-02, 010-154-65-02, 010-154-68-02, 010-154-71-02, 010-154-74-02, 010-154-75-02, 010-154-77-02, 010-154-81-02, 010-154-81-02-80, 010-154-81-02-88, 010-154-83-02, 010-154-94-02, 010-154-95-02, 010-154-96-02, 010-154-98-02, 011 154 09 02 80, 011-154-04-02, 011-154-05-02, 011-154-06-02, 011-154-07-02, 011-154-08-02, 011-154-09-02, 011-154-10-02, 011-154-32-02, 011-154-70-02, 011-154-78-02, 101549502, 109 154 40 02, 81545202, A 008 154 72 02, A 008 154 73 02, A 009 154 30 02, A 009 154 30 02 80, A 009 154 56 02, A 010 154 78 02, A 011 154 78 02, A 109 154 40 02, A-010-154-75-02, A0081545202, A0081547302, A0081547402, A0081548402, A0081549202, A0081549602, A008154960280, A0081549702, A0091540102, A0091540202, A0091541202, A0091541302, A0091541702, A0091541902

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:

• Bearings
• Brushes
• Brush Holder
• Slip Rings
• Rectifier
• Diodes
• Rotor
• Clutch Pulley
• Insulators

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.