Description
Vehicle Compatibility & OE Cross Reference
Alternator voltage regulator for Bosch alternators on select Toyota applications where the original regulator matches an A Circuit design with IR/IF internal regulator internal fan configuration and a 4 pin connector in the IG S L DFM or IG S L FR layout. Confirm by alternator label, plug format and OE cross reference.
OE Numbers By Brand
- Toyota: 27700-0L020
Application Note
Referenced as Bosch 4 pin Toyota regulator for KCB1 and E4 alternator applications where the original regulator uses the same 4 pin IG S L DFM or IG S L FR configuration.
Specifications
- Reference: REG1075
- Part Type: Alternator Voltage Regulator
- Manufacturer: Bosch
- System Voltage: 12V
- Regulated Voltage (Set Point): 14.4V (VS=14.4V)
- Charging Voltage: 14.4V
- Operating Voltage: 14V
- Circuit: A Circuit
- Type: IR/IF (Internal Regulator / Internal Fan)
- Connector / Pins: 4 Pin IG S L DFM / 4 Pin IG S L FR
- Plug Type: IDIG Sense L CPU
- Specification: 5 Sec. LRC
- Active Lamp: Yes
- Short Circuit Protection: Yes
- OE Number: Toyota 27700-0L020
Features
- Regulates alternator field current to maintain stable charging on compatible Bosch Toyota alternators
- 14.4V charging specification for matching 12V electrical systems
- 4 pin IG S L DFM or IG S L FR connection with IDIG Sense L CPU plug type
- A Circuit control strategy and IR/IF internal regulator internal fan configuration for specified alternator designs
- 5 sec LRC specification with active lamp function and short circuit protection
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, plug photos and OE number matching
- Trusted by workshops and DIY customers for reliable charging system components
Trusted by thousands of South African drivers for quality and durability.
Installation & Maintenance Tips
- Disconnect the battery before alternator removal or regulator replacement
- Match the regulator by Bosch manufacturer, A Circuit design and the 4 pin IG S L DFM or IG S L FR plug layout
- Inspect brushes, slip rings and rotor condition while the alternator is open and replace worn parts where required
- Ensure battery terminals and earth connections are clean and tight to prevent voltage drop
- After installation, verify charging voltage at idle and under load and confirm warning lamp behaviour
- If you are unsure about alternator repairs, have the regulator 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).