Vehicle Compatibility
Alternator voltage regulator for Lucas / Prestolite alternator applications using the 17ACR regulator configuration. Listed against OE references for select Ford and Jaguar applications, and also used on certain Massey Ferguson and Talbot alternator builds where the regulator matches the same A-circuit control strategy and wiring layout. Regulator is specified as 2-wire (D- and D+) with DF casing connection and a set voltage of VS=14.3V. Confirm by alternator series (17ACR), circuit type, and terminal layout before ordering.
- Lucas / Prestolite: 17ACR alternator applications (A-circuit)
- Ford: Alternator applications matching OE 69EB10316BA
- Jaguar: Alternator applications matching OE AAU4842; ABU9969; BAU4443; 37H6911
- Massey Ferguson: Alternator applications matching OE 1887416M1; 1897383M1
- Talbot: Alternator applications matching OE 75062449
Specifications
- Reference: REG4007CX
- Part Type: Alternator Voltage Regulator
- System Voltage: 12V
- Alternator Series: Lucas / Prestolite 17ACR
- Circuit: A-Circuit
- Regulated Voltage (Set Point): 14.3V (VS=14.3V)
- Wiring: 2-Wire (D- and D+)
- Connections / Terminals: D-; D+; DF (Casing)
- Configuration: IR/EF (Internal Regulator / External Field)
Features
- Correct Lucas / Prestolite 17ACR A-circuit regulation behaviour for matched alternator designs
- 14.3V set point (VS=14.3V) to support stable charging performance on 12V systems
- Matched 2-wire D- and D+ layout for compatible harness and alternator interfaces
- DF casing connection design to suit the correct alternator housing and field control format
- Helps restore charging stability where regulator faults cause undercharge, overcharge, or warning lamp issues
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 regulator replacement
- Confirm the alternator is Lucas / Prestolite 17ACR and uses an A-circuit regulator before fitting
- Match the wiring layout exactly: 2-wire (D- and D+) and DF casing connection
- Inspect brushes, slip rings and internal connections while the alternator is open and replace worn parts as required
- Ensure all charging circuit connections are clean and tight to prevent voltage drop and repeat failures
- After installation, verify charging voltage under load and check for abnormal AC ripple
- If you are unsure about alternator repairs, have the unit fitted and tested by a qualified auto electrician
