Click to zoom in
Specifications
- MFR: BOSCH
- FEATURE 1: 100% New
- FEATURE 2: BSS (COM) Regulator
- FEATURE 3: COM ID Code: 6
- FEATURE 4: B-Circuit, Volt Set Controlled by ECU
- FEATURE 5: BSS Type 1 Terminal Function.
- FEATURE 6: Regulation is controlled by vehicle.
- FEATURE 7: Stator Activated.
- FEATURE 8: With Field Short Circuit Protection.
- SPECS FOR: Bosch IR/IF Alternators
- SPECS: 12 Volt, B-Circuit, Volt Set range is from 10.7V to 16.0V
Used On
- BMW (2006-2013)
Replaces
BMW: 12-31-7-552-817, 12-31-7-561-924, 12-31-7-561-939
Bosch: F 00M 346 013, F 00M 346 024, F 00M 346 033, F 00M 346 089
Lester Numbers
11301, 11302, 11362, 20446
Unit Numbers
BMW: 12-31-7-542-351, 12-31-7-550-469, 12-31-7-550-968, 12-31-7-551-256, 12-31-7-551-256, 12-31-7-555-926, 12-31-7-558-219, 12-31-7-558-220, 12-31-7-560-985, 12-31-7-560-986, 12-31-7-582-699
Bosch: 0 121 715 012, 0 121 715 016, 0 121 715 017, 0 121 715 018, 0 121 715 112, 0 121 715 112, 0 121 715 116, 0 121 715 117, 0 121 715 118, 4884
Marelli: 063537151120
Original Reference Number: 7551256-07
Steyr: 7551256
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.
Read More