Description
Vehicle Compatibility
Complete alternator rectifier for Bosch alternator applications where the alternator uses a matching 120mm outer diameter rectifier plate and the same diode configuration. Specified as Bosch 12V IR/IF (KCB1) type with 6 avalanche diodes and a 50A rating for compatible alternator rebuild work. Listed for select Toyota alternator applications on Corolla and Avensis, and also cross-referenced to VAG 038903023P where the alternator/rectifier specification matches. Confirm by alternator label, rectifier OD and terminal layout before ordering.
- Toyota: Corolla; Avensis (Bosch alternator applications where IR/IF KCB1 rectifier spec matches)
- VAG: 038903023P
Specifications
- Reference: RCT1052
- Part Type: Alternator Rectifier
- Alternator Manufacturer: Bosch
- System Voltage: 12V
- Type: IR/IF (KCB1)
- Outer Diameter: 120mm
- Current Strength From: 50A
- Number Of Diodes: 6
- Diode Type: Avalanche Diode
OE Numbers
- VAG: 038903023P
Features
- Bosch rectifier assembly to support alternator overhaul on compatible 12V IR/IF (KCB1) alternators
- 120mm rectifier plate with 6 diode layout designed for matched Bosch alternator housings
- 50A avalanche diode specification for stable rectification and improved resilience under load
- Helps restore charging performance where failed diodes cause low charge, battery drain, or excessive AC ripple
- Confirming by alternator label and rectifier diameter reduces 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 (120mm) and Bosch IR/IF (KCB1) type 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).