Vehicle Application
Daimler [Europe] Car
DAIMLER XJ [X30_] 4.0L V8 Long AJ-V8 216kW 1997–2003
DAIMLER XJ [X30_] 4.0L Supercharged V8 DC 267kW 1997–2003
Jaguar Car
Vanden Plas V8 4.0L 3996cc 244cid 1998–2003
XJ8 V8 4.0L 3996cc 244cid 1998–2003
XJR V8 4.0L 3996cc 244cid 1998–2003
XK8 V8 4.0L 3996cc 244cid 1997–2002
XK8 V8 4.2L 4196cc 256cid 2003
XKR V8 4.0L 3996cc 244cid 2000–2002
XKR V8 4.2L 4196cc 256cid 2003
Jaguar [Europe] Car
XJ Sport 3.2L V8 1997–1999
XJ8 3.2L V8 1997–2000
XJ8 4.0L V8 1997–2005
XJR 4.0L V8 1997–2005
XK8 4.0L V8 1996–2000
XKR 4.0L V8 1996–2000
Precision aftermarket replacement part
Regulates alternator output voltage
Helps maintain proper battery charging
Supports stable charging system performance
Manufactured to match original specifications
Designed for dependable long-term operation
Ideal for alternator rebuilding and repair
Cross-referenced to OEM and aftermarket part numbers
The voltage regulator controls the alternator's output by regulating current supplied to the rotor field winding. As electrical demand changes, the regulator continuously adjusts field current to maintain the proper charging voltage for the battery and the vehicle's electrical system.
A properly functioning voltage regulator helps prevent battery overcharging and undercharging while protecting sensitive electrical components from excessive voltage. Because charging system performance depends on the interaction between the regulator, rotor, stator, rectifier, and battery, replacing a faulty regulator is an important step in restoring alternator performance.
Replace the voltage regulator if you notice:
Battery overcharging
Battery not charging
Low charging voltage
High charging voltage
Battery warning light illuminated
Intermittent charging problems
Headlights that brighten or dim with engine speed
Charging system failure during testing
Voltage regulator failure discovered during alternator rebuilding
Installation should be performed by a qualified technician or experienced alternator rebuilder. Before installing the new regulator, inspect the brushes, brush holder, slip rings, rotor, stator, rectifier, wiring, and electrical connections for signs of wear or damage.
Always verify connector configuration and mounting style before installation. After assembly, bench-test the alternator to confirm proper charging voltage and overall charging system performance.
Inspect other common wear components to help maximize charging system reliability:
RC Auto Electric specializes in alternator and starter rebuilding components for professional rebuilders, repair shops, automotive technicians, and DIY enthusiasts. Our extensive catalog includes thousands of OEM and aftermarket electrical components backed by accurate cross-reference information to help simplify part identification and reduce ordering mistakes.
Compatibility information is provided as a reference only. Manufacturing revisions, production changes, and previous rebuilding modifications may affect internal alternator components. Always compare the original part, connector configuration, mounting style, voltage specifications, cross-reference numbers, and product photographs before installation. If you are unsure about compatibility, contact RC Auto Electric before ordering.