Standard Ignition VR-425 voltage regulator for the 1981-1992 Jaguar XJS V12 5.3L, the 1992 XJS 6-cylinder 4.0L and other vehicles holds the alternator's charging voltage at a steady level.
- Electronic PC board encapsulated in epoxy to resist failure from vibration and corrosion of electrical connections
- Circuit board manufactured by Standard Ignition for precise operation
- High-grade materials chosen for extended service life
- Two male eye-ring terminals, with no connector housing
Quick facts
- Part: Standard Ignition VR-425 voltage regulator
- Fits: 1981-1992 Jaguar XJS V12 5.3L, the 1992 XJS 6-cylinder 4.0L and other vehicles
- Condition: New
A failing regulator can show up as a battery that runs down, dim or flickering lights, or a charging warning light, though a weak battery, a worn alternator or a corroded connection can cause those too. With the engine off and cool, look at the battery terminals and alternator connections for corrosion or looseness first; a shop can test charging output. If the regulator is the cause, this part replaces it.
Fits
It fits the 1981-1992 Jaguar XJS V12 5.3L and the 1992 XJS 6-cylinder 4.0L, the 1987-1988 Land Rover Range Rover V8 3.5L and the 1989-1992 Range Rover V8 3.9L, and the 1981-1987 Jaguar XJ6 6-cylinder 4.2L and the 1987 XJ6 6-cylinder 3.6L.
Specifications
Fit and size
- Mounting location: alternator
- Quantity per vehicle: 1
- Dimensions: 2.4 x 1.27 x 0.55 in (60.96 x 32.258 x 13.97 mm)
- Terminals: 2, male, eye ring
- Voltage: 12 V
Build and materials
- Construction: electronic regulator with epoxy-encapsulated PC board
- Connector: none
- Condition: New
- Country of origin: China
In the box
One voltage regulator; the vehicle takes one. Hardware, a mounting bracket and instructions are not included, so plan on new fasteners.
Interchange: R977 · VR813 · VR638 · AEU2750 · JLM277 · UCB133
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
R977, VR813, VR638, AEU2750, JLM277, UCB133, VR-425
Frequently Asked Questions
Does the Standard Ignition VR-425 fit the 1989-1992 Land Rover Range Rover V8 3.9L?
Yes. The Standard Ignition VR-425 voltage regulator fits the 1989-1992 Range Rover V8 3.9L, and also the 1987-1988 Land Rover Range Rover V8 3.5L.
Will this voltage regulator work on a 1992 Jaguar XJS with the 6-cylinder 4.0L?
Yes. Standard Ignition VR-425 fits the 1992 Jaguar XJS 6-cylinder 4.0L, as well as the 1981-1992 XJS V12 5.3L.
How many terminals does this alternator voltage regulator have, and what type?
This regulator has two male eye-ring terminals and no connector housing. It is a 12-volt unit.
Does this alternator voltage regulator come with a mounting bracket or screws?
No. Hardware, a mounting bracket and instructions are not included, so have new fasteners ready before you start.
Why is the VR-425 circuit board encapsulated in epoxy?
The VR-425 electronic PC board is encapsulated in epoxy to resist failure that vibration and corrosion of the electrical connections may cause.
