OEM Bosch Voltage Regulator IB5302

Specifications

• MFR: BOSCH
• FEATURE 1: 100% New
• SPECS FOR: Bosch IR/IF Alternators
• SPECS: 12 Volt, B-Circuit, BSS Terminals, 14.3 Vset

Used On

• Porsche (2007-2011)

Replaces

Bosch: F 00M 145 651, F 00M A45 302

Lester Numbers

11337, 11338

Unit Numbers

Bosch: 0 124 525 106, 0 124 525 107
Porsche: 997-603-022-00, 997-603-022-01, 997-603-022-02, 997-603-022-03, 997-603-022-04, 997-603-022-05, 997-603-022-EX

Vehicle Application

Porsche Car
911 H6 3.6L 3596cc 2007-2009
911 H6 3.6L 3596cc 2007-2008
911 H6 3.6L 3598cc 2008
911 H6 3.6L 3606cc 2007-2009
911 H6 3.6L 3614cc 2009
911 H6 3.8L 3800cc 2010
911 H6 3.8L 3800cc 2011
911 H6 3.8L 3824cc 2007-2008
911 H6 3.8L 3824cc 2010
911 H6 4.0L 3996cc 2011
Boxster H6 2.7L 2687cc 2007-2008
Boxster H6 3.4L 3387cc 2007-2008
Cayman H6 2.7L 2687cc 2007-2008
Cayman H6 3.4L 3387cc 2007-2008

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:

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

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.