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300Tdi Alternators

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I have a 1994 Discovery 300tdi fitted to an early 90 and after a fun pay and play day need to look at changing the alternator.

From what I understand the alternator currently fitted should be AMR4248 (100amp).

Ideally I'd get this one repaired and purchase a spare.

Looking at various second hand ones there seem to be a number of different versions. I was looking at buying the standard one from CookieMonster but looking at the picture it would seem to be from a defender where the body is different.

Some are 120amp but I do not know what the wiring connections are.

One thing I don't want to do is to change the connections to the alternator as I want to keep the spare interchangeable with the one fitted.

Does anyone know if 300tdi alternators are interchangeable both in terms of fitting and wiring connections or if there any pitfalls to avoid?



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Defender has 70amp, disco 100amp / 120 amp.

All the fittings are the same.

If you have the choice fit the later smaller pulley and shorter belt, the alternator spins faster then and charges better at idle.

If you use a disco alternator on a defender you are supposed to update the wiring from alternator to battery to cope with the higher output.

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