Description
Vehicle Compatibility & OE Cross Reference
Alternator voltage regulator for Nippon Denso alternators 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 FR layout (plug type IDIG Sense L CPU). Listed for Toyota Quantum 2.5L diesel and Honda applications where the same regulator and OE references apply. Confirm by regulator plug style, mounting footprint and OE cross reference before ordering.
Listed Applications
- Toyota: Quantum 2.5L Diesel
- Honda: Applications using a matching Nippon Denso 4 pin IG S L FR regulator
OE Numbers By Brand
- Toyota: 27700-50040
- Honda: 31150P5A003; 31150P5A0030; 31150P5G003; 31150P5G0030
Specifications
- Reference: REG6041
- Part Type: Alternator Voltage Regulator
- Manufacturer: Nippon Denso
- System Voltage: 12V
- Regulated Voltage (Set Point): 14.5V (VS=14.5V)
- Charging Voltage: 14.4V
- Operating Voltage: 14V
- Circuit: A Circuit
- Type: IR/IF (Internal Regulator / Internal Fan)
- Connector / Pins: 4 Pin (IG S L FR)
- Plug Type: IDIG Sense L CPU
- Specification: 2.5 Sec. LRC
- Lamp Function: Inactive Lamp
- Mounting Points Diameter: 63.5mm
- Short Circuit Protection: Yes
- OE Numbers: Toyota 27700-50040; Honda 31150P5A003, 31150P5A0030, 31150P5G003, 31150P5G0030
Features
- Supports consistent charging by controlling alternator field current on compatible Nippon Denso alternators
- 4 pin IG S L FR connector format with IDIG Sense L CPU plug type for correct interface matching
- A Circuit design with IR/IF internal regulator internal fan configuration for specified alternator layouts
- Mounting footprint includes 63.5mm mounting points diameter for correct physical matching
- Short circuit protection with inactive lamp characteristic for supported applications
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 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 regulator replacement
- Match the regulator by Nippon Denso manufacturer, A Circuit design, and the 4 pin IG S L FR plug layout
- Confirm the mounting footprint, including the 63.5mm mounting points diameter, matches the original regulator
- Inspect brushes and slip rings while the alternator is open and replace worn components where required
- Ensure battery terminals and earth connections are clean and tight to prevent voltage drop and repeat failures
- After installation, verify charging voltage at idle and under load to confirm stable regulation
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).