Description
Vehicle Compatibility
Complete alternator rectifier for Bosch alternator applications where the alternator uses a matching 112mm outer diameter rectifier plate and the same diode configuration. Specified as Bosch IR/IF type with 8 avalanche diodes and a 50A rating for compatible alternator rebuild work. Commonly listed for VW / Audi applications using VAG rectifier references 028903359C and 030903023C, and also seen on certain Mercedes and BMW alternator builds where the rectifier specification matches. Confirm by alternator label, rectifier OD and terminal layout before ordering.
- VAG (VW / Audi): 028903359C; 030903023C
- Mercedes-Benz: Bosch alternator applications where the 112mm 8-diode rectifier specification matches
- BMW: Bosch alternator applications where the 112mm 8-diode rectifier specification matches
Specifications
- Reference: RCT1031
- Part Type: Alternator Rectifier
- Alternator Manufacturer: Bosch Type
- Type: IR/IF
- System Voltage: 12V
- Outer Diameter: 112mm
- Current Strength From: 50A
- Number Of Diodes: 8
- Diode Type: Avalanche Diode
OE Numbers
- VAG: 028903359C
- VAG: 030903023C
Features
- 112mm Bosch-type rectifier plate designed for matched alternator housings using an 8-diode layout
- 50A avalanche diode specification for stable rectification and improved resilience under load
- Supports alternator overhaul where failed diodes cause low charge, battery drain, or excessive AC ripple
- Common VAG coverage where OE references match, with cross-application use on Bosch alternators in other makes
- Best practice is to confirm rectifier diameter and OE reference to avoid incorrect fitment on similar-looking rectifiers
Why Buy From Us
- Local South African stock with nationwide courier delivery
- 12-month warranty subject to correct application and installation
- Fitment support using alternator labels and clear photos of the existing rectifier and terminal layout
- Trusted by workshops and fleet operators for dependable charging system components
Trusted by thousands of South African drivers for quality and durability.
Installation & Maintenance Tips
- Disconnect the battery before alternator removal or rectifier replacement
- Confirm rectifier outer diameter (112mm) and diode layout (8 diodes) before fitting
- Inspect stator windings, solder joints and insulation while the alternator is open
- Replace worn brushes and check slip rings during the rebuild to prevent repeat failures
- After installation, verify charging voltage under load and test for abnormal AC ripple
- If you are unsure about alternator repairs, have the unit fitted and tested by a qualified auto electrician
Important: Product information, kit contents and compatibility are provided as a guide and may contain errors or omissions. Please verify that this part and any included components are correct for your vehicle before installation. For full details see our Website Disclaimer (Errors & Omissions).