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Alternators - how much £


simonr
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I was wondering, having never looked in to it before, what I should expect to pay for a new 12v alternator.

I would like one which spits out at least 100A - and I want to buy a new one. I know I could pick a pre-shagged one from a scrappy but it's something we rely on (particularly with an auto) and I'm happy to buy new just for the security.

I have also heard of new brushless alternators (with magnets on the rotor and regular field windings). Could be a good plan for the likes of us - but I've not found any for sale yet!

Any ideas or even links would be appreciated!

Si

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I have a Marelli 100 amp from a Discovery, got mine from Sodbury sortout for 70 quid :D

Paddocks---------Discovery 300Tdi Alternator - Magnetti Marelli - A127i 100amp to 18L12433, 19L00409, 21L36432 SPECIAL OFFER 99.00

AMR4248 Alternator A127i 100amp 18L12424 to TA534103, 18L12424 to TA703236, 19L00410 to TA534103, 19L00410 to TA703236, 21L36433 to TA534103, 21L36433 to TA703236 112.50

AMR5425 Alternator A127i 100 amp from VA534104 and VA703237 139.00

here

DLS---------------Alternator Def 300 Tdi A127/100amp AMR4247 £118.72 plus vat, £139.50 inc vat

Alternator Def Td5 120amp ERR6999 £167.66 plus vat, £197.00 inc vat

Note: Our units are outright purchase requiring no Exchange.

here

:D

Edited by western
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I have got the original 4.2 alternator which is 100 amp but I have a spare that cost about £110 same as tony but I got it from Broklin 4x4 in Southampton.

I have a few freelander ones knocking around in the shed that are 120amp and have a vacum pump attached.

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Si

An off the wall alternator idea for you...

Fit the engine with a compact constant output hydraulic pump like the ZF74 used on a Milemarker, then fit an alternator in a nice warm dry place, driven at it's optimum charging speed by a small hydraulic motor (you would have to choose size of motor carefully to do this). You would then have a much more reliable alternator (out of water and mud) and one which would give full charging output at idle....

Just an idea :)

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Wouldn't a brushless alternator need a position transducer so it can 'commutate' electronically? I suppose that's why it'd be the clever (and therefore expensive) type.

Thanks all - eBay sounds a good option, but I'll check out one of westerns options. It gives me an idea of what is good value at least.

[Gobbledegook]

Turbo - errr no! - In most brushless dc motors they measure the reluctance in the coils to determine where the rotor is, so the motors own coils are also the sensors. I would guess it could work something like that.

It may even be one set of static coils to energise the rotor and another static set to pick up the current generated - working a bit like an induction motor.

In effect this is like a regular alternator but with the field and rotor coils reversed - and using half a transformer on the rotor and half on the stator to pass the current to the rotor.

If you got the phase relationship right between the two coils on the rotor, you could feed DC into the stator half of the 'transformer' and it would induce an appropriate field in the rotor as a pole is passing one of the stator generator coils.

[Gobbledegook/] :)

I'll settle for just buying one! (left polyphase AC behind a long time ago)

Si

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didn't someone mention BMW alternators that are sealed and cooled by water? so waterproofed as standard.

I have read recently some crazy frog type alternator that not only supplies 12 V but gives 240 V AC so you can run a welder should you be so inclined.

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Jon White has got a mondeo one, which sounds interesting, 100 amp charge, but 60 amp ON TICKOVER Hmmmm

Unsure of Part numbers, maybe PM him ?

Nige

pt no. is ask mark to get him one at the scrappies ;)

same as wot i run, at 15 quid a pop they're good for the money imo, they're bosch alternators and survive well in the mud

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pt no. is ask mark to get him one at the scrappies ;)

same as wot i run, at 15 quid a pop they're good for the money imo, they're bosch alternators and survive well in the mud

I've had a couple of Ford ones from the scrappy - which is where the 'pre shagged' statement came from. Neither lasted very long and so I'm now running the original LR one again (back to 55A!). This time decided to buy a new kicking one which will hopefully last a while.

BMW one sounds interesting!

Si

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i think the bosch units survive better in mud, i used to run anything i could get my hands on, lucas of metros were plentiful but i was killing them everytime i went offroad. first mondeo one lasted me 2.5 years, only on my second now, both were/are from scrappies

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  • 3 weeks later...

Sorry to drag this to the top again :)

Paddocks---------Discovery 300Tdi Alternator - Magnetti Marelli - A127i 100amp to 18L12433, 19L00409, 21L36432 SPECIAL OFFER 99.00

AMR4248 Alternator A127i 100amp 18L12424 to TA534103, 18L12424 to TA703236, 19L00410 to TA534103, 19L00410 to TA703236, 21L36433 to TA534103, 21L36433 to TA703236 112.50

AMR5425 Alternator A127i 100 amp from VA534104 and VA703237 139.00

here

I want to fit one of these 100 Amp Alternators to my 1996 Defender 90 300TDi. But which one will fit &, whats the difference between between them.

Many thanks

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BMW one sounds interesting!

Jules, are any of your Freelander ones from TD4s? Just thinking as its a BMW engine........ I maight have to take a look at one of those, any alternator I change to has to have a vacuum pump off the back as thats where the vacuum pump is on a 2.8.

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