Aftermarket Bosch Voltage Regulator IB200

Specifications

• MFR: BOSCH
• FEATURE 1: 100% New
• FEATURE 2: Soft start, LRC
• FEATURE 3: Ignition, lamp, or stator activated
• NOTE 1: Active lamp function - with output.
• NOTE 2: Stator energizing requires a stator signal greater than 10VAC (PP) - use VRC101-34 Regulator Test Signal Amplifier.
• SPECS FOR: Bosch IR/LC Water Cooled Alternators
• SPECS: 12 Volt, A-Circuit, IG-L Terminals (IG=15, L=61E), 14.3 Vset

Used On

• BMW (1999-2004)
• Land Rover (2003-2009)

Replaces

Bosch: F 00M 255 200, F 00M 255 201

Lester Numbers

11074, 13815

Unit Numbers

BMW: 12-31-1-705-483, 12-31-1-705-557, 12-31-7-508-052, 12-31-7-508-054, 12-31-7-508-258, 12-31-7-508-286
Bosch: 0 122 0AA 1H0, 0 122 0AA 1J0, 0 122 468 015
Land Rover: YLE000040

Vehicle Application

BMW - Europe Car
5 (E39) Eng.M62 B35 (358S1), M62 B35 (358S2) 535 i 173kW M62 B35 (358S1), M62 B35 (358S2) 1996–1999
5 (E39) Eng.M62 B35 (358S2) 535 i 180kW M62 B35 (358S2) 2000–2003
5 (E39) Eng.M62 B44 (448S1), M62 B44 (448S2) 540 i 210kW M62 B44 (448S1), M62 B44 (448S2) 1996–2003
5 Touring (E39) Eng.M62 B44 (448S1), M62 B44 (448S2) 540 i 210kW M62 B44 (448S1), M62 B44 (448S2) 1997–2004
7 (E38) Eng.M62 B44 (448S1), M62 B44 (448S2) 740 i, iL 210kW M62 B44 (448S1), M62 B44 (448S2) 1998–2001
7 (E38) Eng.M73 B54 (54121), M73 B54 (54122) 750 i, iL 240kW M73 B54 (54121), M73 B54 (54122) 1998–2001
740 4400, M62 1998–2001
P15 3500, M62 1998–2003
P3500 4400, M62 1998–2004
Scorpio 3500, M62 1998–2001
Vigor 5400, M73 1998–2001
X5 (E53) Eng.M62 B44 (448S2) 4.4 i 210kW M62 B44 (448S2) 2000–2003
X5 (E53) Eng.M62 B46 (468S1) 4.6 is 255kW M62 B46 (468S1) 2002–2003
X5 4400, M62 B44 2000–2003
X5 4600, 46 8 S 2001–2003

BMW Car
540i V8 4.4L 4398cc 1999–2003
740i V8 4.4L 4398cc 1999–2001
740iL V8 4.4L 4398cc 1999–2001
750iL V12 5.4L 5379cc 1999–2001

BMW Truck
X5 V8 4.4L 4398cc 2000–2004
X5 V8 4.6L 4598cc 2002–2003

Land Rover - Europe Truck
Range Rover III 4400, V8, M62 B44 2002–2005

Land Rover Truck
Range Rover Sport V8 4.4L 4394cc 2009
Range Rover V8 4.4L 4398cc M62; VIN 1 2003–2004
Range Rover V8 4.4L 4398cc 2003–2005
Range Rover V8 4.4L 4394cc 2006–2009
Range Rover V8 4.4L 4394cc VIN 5 2006–2009

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.