Used alternator: how to buy one that works
Used alternator: how to buy one that works
To buy the right used alternator, match the part number to your car, check the amp rating, and confirm the pulley type and plug match. An alternator is a sound used buy: it either charges or it does not, and a genuine used unit costs a fraction of a new one. The trick is ordering the version that fits your exact car.
How do I match the right alternator?
The same model often had several alternators depending on the engine and the equipment fitted. The surest match is the part number stamped on the casing of your old unit. Match that to the listing and the guesswork is gone. No number to hand? Send us your registration and we will identify the correct alternator for your exact car.
Does the amp rating matter?
Yes. Cars with more electrical load, such as air conditioning, heated screens or a bigger engine, often run a higher output alternator measured in amps. Fitting one with too low a rating can leave the battery undercharged. Match the amp rating to your car, which the part number usually pins down for you.
What about the pulley and the plug?
Check two physical details. The pulley must be the right type, either a plain pulley or a one-way clutch (OAD) pulley, with the right number of belt grooves. The wiring plug must match your loom. A unit that is electrically right but has the wrong pulley or plug will not fit cleanly, so confirm both against your old one.
What should I check on a used alternator?
Look at the listing photos for a clean casing with no heavy corrosion, intact mounting ears, and a pulley that is not chewed. A good seller states whether the unit was tested and turning. Light surface wear is normal on a used part; cracked mounts or a seized pulley are ones to avoid.
Buy with confidence
Browse our electrical and electronics parts for current stock. Every unit is inspected, ships with free tracked UK delivery, and is covered by our 30 day returns policy. Send us your registration or old part number and we will match the right alternator before you buy. Parts worth your trust.