Description
Vehicle Compatibility
Alternator voltage regulator for select Mercedes-Benz alternator applications, commonly used on Mercedes Sprinter models where the alternator uses the same regulator specification and charging characteristics. Designed with an active lamp function, 2.5 sec LRC behaviour and short circuit protection to suit compatible Mercedes charging systems. Confirm by alternator label and the OE references listed below before ordering.
- Mercedes-Benz: Sprinter alternator applications matching OE references listed below
Specifications
- Reference: REG1031
- Part Type: Alternator Voltage Regulator
- System Voltage: 12V
- Operating Voltage: 14V
- Charging Voltage: 14.4V
- Specification: 2.5 Sec. LRC; Active Lamp
- Short Circuit Protection: Yes
OE Numbers
- Mercedes-Benz: 003-154-28-06
- Mercedes-Benz: 003-154-55-06
- Mercedes-Benz: 003-154-56-06
- Mercedes-Benz: A0121541502
- Mercedes-Benz: A0121542002
- Mercedes-Benz: A0131541102
- Mercedes-Benz: A0131541702
- Mercedes-Benz: 0031542806
- Mercedes-Benz: 0031545506
- Mercedes-Benz: 0121542002
- Mercedes-Benz: 0121542402
- Mercedes-Benz: 0121544602
- Mercedes-Benz: 0131541502
- Mercedes-Benz: 0131541702
Features
- Matched regulator specification for Mercedes alternator designs using the listed OE references
- Active lamp function to support correct warning lamp behaviour on compatible Sprinter charging systems
- 2.5 second LRC behaviour to stabilise charge control during start-up and changing loads
- 14.4V charging control to maintain stable battery charging on 12V systems
- Short circuit protection to support reliability and reduce repeat failures on compatible alternator builds
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 regulator and plug 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 voltage regulator replacement
- Confirm the alternator OE reference matches one of the listed numbers before fitting
- Inspect brushes, slip rings and internal connections while the alternator is open and replace worn parts as required
- Ensure charging circuit connections and earth points are clean and tight to prevent voltage drop and repeat failures
- After installation, verify charging voltage under load and confirm warning lamp behaviour is correct
- 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).