Used Vauxhall Cavalier Alternator

The Cavalier ran across two main UK generations: the Mk2 (1981–1988) and the Mk3 (1988–1995), with the Mk3 receiving a facelift in 1992. Alternators generally follow the engine code rather than the model year, so the most reliable way to find a compatible unit is to quote your engine code — found on your V5 or via a VIN check — to the breaker. Mixing units across the Mk2 and Mk3 boundary is unlikely to work without modification, and even within the Mk3 you should confirm with the breaker whether a pre-1992 or post-1992 unit suits your exact build.

Both cars sit within the Mk3 generation (1988–1995), but the 1992 facelift can bring ancillary and mounting changes that affect whether alternators swap straight over. The engine code is the most important detail here — if both cars share the same engine code the chances of compatibility are much higher, but you should still confirm with the breaker against your specific registration before buying.

Trim level does not affect alternator fitment; L, GL, GLS, and CDX are cosmetic and equipment-level distinctions rather than mechanical ones. What matters is the engine code, which will be the same across trim levels sharing the same engine, so a CDX alternator from the correct engine family is mechanically no different to one from an L-spec car. Bear in mind that higher trims may carry additional electrical load equipment, but the alternator specification is determined by the engine variant, not the badge.

Yes, fuel type matters — petrol and diesel engines are different units with different ancillary layouts, so their alternators are not interchangeable. Always tell the breaker both your engine code and whether the car is petrol or diesel to avoid being sent the wrong part.

Gearbox type can influence ancillary belt routing and bracket positioning on some engine variants, so it is worth telling the breaker whether your car is manual or automatic alongside the engine code. In many cases the alternator itself is the same unit, but confirming this against your registration with the breaker is the safest approach before purchasing a used part.

Alternator fitment is governed by the engine code above all else, and different engine displacements within the Cavalier range were often distinct engine families with different mounting and output requirements. Supply your exact engine code to the breaker rather than relying on engine size alone, as a 1.8 and a 2.0 may share a code family on some variants but not others — the breaker can cross-reference this accurately against your registration.