Description
Vehicle Compatibility & Applications
This Lucas / Prestolite 12V alternator voltage regulator with brush (AS123 type) is used on a wide range of passenger, light commercial, agricultural and industrial applications. It is suitable where the original regulator matches this style and the alternator rating is around 60–70A “G” type. Always compare your old regulator, alternator type and plug connections before using REG4010.
- Bell
- Chevrolet
- Deutz
- Ford: 1.8L / 2.2L; 2.0L V6 / 3.0L V6; Anglia; Bantam 1.4L / 1.6L; Capri 1.6L; Cortina 1.3L / 1.6L / 2.0L / 3.0L; Cortina V6; Escort (MK I, MK II); Escort 1.3L / 1.4L / 1.6L; Escort 1400; Fiesta 1.4L; Granada 2.0L / 3.0L; Granada V6; Laser; Meteor 1.4L / 1.6L; Sapphire 2.0L / 3.0L; Sapphire V6; Sierra 1.6L / 2.0L / 3.0L; Sierra V6; XR3; Ford tractors
- Hyster
- Isuzu: KB220 2.2L; KB23; Relay mini-bus; WFR and Relay
- JCB: 3CX with Perkins engine
- John Deere
- Land Rover: Defender 90 2.5L diesel; Defender 110 2.5L diesel; Defender V8; Discovery 200 TDi / 300 TDi; Range Rover 2.4L / 2.5L TD
- Leyland: Mini
- Massey Ferguson: tractors
- Mazda: 1.3L / 1.6L / 2.0L; 3.0L V6; B1800 / B2200; Etude 1.6L
- Mercedes-Benz: Unimog
- Mini: Cooper
- Nissan: 1200 / 1400 / 1600 / 1800; E20; forklifts; Primera 1.6L; Sentra 12-valve; Sentra 140 / 160
- Opel: Ascona 1.8L / 2.0L; Kadett 1.3L / 1.6L / 1.8L / 2.0L; Monza 1.3L / 1.6L / 1.8L / 2.0L; Record 2.0L; T-Car
- Perkins
- Rover
- Scania
- Toyota: 18R engine; 2Y / 3Y / 4Y engines; Corolla; Cressida 1.8L / 2.0L; Dyna; Hiace 1.8L / 2.0L; Hilux 1.8L / 2.0L / 2.2L; Stallion 1.8L; Venture 1.8L / 2.0L
- Universal applications
- Volkswagen: Chico; Fox; Golf; Jetta
- Volvo
Use REG4010 wherever the alternator is a Lucas / Prestolite AS123 60–70A “G” type unit and the mounting, plug and brush arrangement match the original regulator.
Specifications
- Reference: REG4010
- Part type: Alternator voltage regulator with brush
- System voltage: 12V (VS = 14.4V)
- Manufacturer type: Lucas / Prestolite
- Circuit regulator: A-circuit
- Type: IR / EF (internal regulator, external fan)
- Alternator type: Lucas 12V AS123, 60 / 70 Amp “G” type
- Primary usage: Ford, Isuzu, Land Rover, Massey Ferguson, Mazda, Opel, Toyota, VW and various industrial / agricultural applications
- Function: Controls alternator output voltage and brush excitation
Features
- Lucas / Prestolite style 12V alternator voltage regulator with integrated brushes
- Designed for AS123 60–70A “G” type alternators used on a wide range of vehicles and machinery
- Internal regulator with external fan configuration for common Lucas alternator setups
- Supports stable charging voltage to protect batteries and sensitive electronics
- Direct replacement layout to simplify alternator reconditioning and workshop repairs
Why Buy From Us
- Local South African stock on REG4010 for faster dispatch and reduced downtime
- Standard 12 month warranty under normal operating and installation conditions
- Fitment assistance available to help match your alternator and regulator style
- Secure online ordering with reliable nationwide courier delivery to workshops and farms
- Trusted by fleet operators, workshops and farmers for dependable charging system parts
Installation & Maintenance Tips
- Disconnect the battery before removing the alternator or regulator to prevent short circuits.
- Confirm that your alternator is a Lucas / Prestolite AS123 type 60–70A “G” unit before fitting REG4010.
- Inspect the slip rings and brushes for excessive wear, burning or contamination and correct as needed.
- Check all main power and earth connections for clean, tight contact to avoid voltage drop and overheating.
- After installation, measure charging voltage at the battery to confirm correct regulation under load.
- For critical fleet or agricultural equipment, have the charging system 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).