New Alternator

[latham91]

Hi all,

I'm after a replacement alternator. Have had a search around and have come up with two as per below:

http://www.island-4x4.co.uk/alternator-4046-amr424...

http://www.ebay.co.uk/itm/RANGE-ROVER-CLASSIC-88-9...


Will either of these be OK in my standard 400 or are they ones to avoid?

Are there any other recommendations out there that won't break the bank?

Thanks

[Sardonicus]

I personally wouldn't use either of those and especially Britpart I would only use as a paper weight or door stop long term, Chimpongas on these forums did some research using a Denso (great quality alternative) to the standard Magneti Marelli unit which in my opinion is a fine quality unit already, especially when you consider that there are 20 + year old TVR's still running around on the original fitment units still doing their stuff if your searching for the OE unit its Land Rover number......AMR 4247 Type.... A127IM - 100 Magneti Marelli Pt No 63341333 alternativly you can probably get your unit rebuilt for far less than a new unit but also keep an eye on Ebay they do come up I purchased a brand new genuine MM unit years ago for about £80 they was clearing new old stock to make room for new lines

Edited by Sardonicus on Tuesday 22 August 15:17

[latham91]

Thanks Sardonicus - the Denso looks a good bet then.

Should I be getting the 100A or the 120A? Presumably the former since it runs through the fabled 100A fuse?....

Will probably refurb my old alternator and keep it as a spare. Did someone say in a previous thread that there's a DIY kit for doing this?

[V8Bart]

Just repaired mine, it was the regulator that went and was an easy fix, this is a complete unit with brushes. (I struggled to find a complete rebuild kit for this unit)
Cost me roughly £15. If you have crunchy grinding bearings though it will be a bigger job.

[Sardonicus]

V8Bart said:

Just repaired mine, it was the regulator that went and was an easy fix, this is a complete unit with brushes. (I struggled to find a complete rebuild kit for this unit)
Cost me roughly £15. If you have crunchy grinding bearings though it will be a bigger job.

This ^ 8 times out of 10 its the brushes knackered or the reg as failed my original failing via the reg (flickering lights) a common failure I would stick with 100A these cars can get by with even less as we dont have all the Range Rover toys

[Oldred_V8S]

Sardonicus said:

V8Bart said:

Just repaired mine, it was the regulator that went and was an easy fix, this is a complete unit with brushes. (I struggled to find a complete rebuild kit for this unit)
Cost me roughly £15. If you have crunchy grinding bearings though it will be a bigger job.

This ^ 8 times out of 10 its the brushes knackered or the reg as failed my original failing via the reg (flickering lights) a common failure I would stick with 100A these cars can get by with even less as we dont have all the Range Rover toys

As the 2 above posts said, repair it yourself. There is a company in Harlow Essex that sells a complete rebuild kit for ~£25-30 I seem to recall. The original alternator will be far superior to a lot of the rubbish out there.

[QBee]

When I needed a new one about 3 years ago, I got a brand new one for just over £100 from Hobson Industries in Lincolnshire. Magnetti Marelli. They take them off brand new Defenders when upgrading them for the military.

just Google them for the contact details.

[ChimpOnGas]

Sardonicus said:

I personally wouldn't use either of those and especially Britpart I would only use as a paper weight or door stop long term, Chimpongas on these forums did some research using a Denso (great quality alternative) to the standard Magneti Marelli unit which in my opinion is a fine quality unit already.]

The Land Rover part number for the original Magneti Marelli 100 amp alternator fitted all Chimaeras is AMR4247G, you could buy it from a TVR parts specialist but the cost is £153.54 including VAT & delivery and there's no mention of what brand it is, I suspect that means it'll be one of the cheaper makes you could have off EBay for a lot less or they would be shouting about it being a quality brand.

Interestingly I discovered when Land Rover fitted a heated front screen to Range Rovers & Discoveries in 1997/8 they also uprated the alternator from 100 amps to 120 amps, the body dimensions and mounting points of this higher output alternator are exactly the same as our 100 amp AMR4247G alternator making the 120 amp AMR2938E is a direct replacement to AMR4247G.

I wanted a Denso brand alternator, Denso is a quality make you can trust and if you look into it you'll actually find they've owned the Magneti Marelli factory in Italy since 2004 so I started researching how much the Land Rover parts specialists charge for a genuine 120 amp AMR2938E, I got prices ranging from £200 - £150 but eventually found one LR parts specialist selling a genuine Denso brand AMR2938E for £145 including VAT & postage.

Before I pulled the trigger I thought rather than keep Googling 'AMR2938E' I would get Denso's own part number and do a few searches on that, the Denso part number for AMR2938E is DAN016. Searching on DAN016 lead me to an Ebay listing that seemed to be Denso's own Ebay shop.

Here it is....

http://www.ebay.co.uk/itm/NEW-OE-DENSO-DAN016-ALTE...

This 120amp alternator comes direct from Denso who own Magneti Marelli, the price was and still is an excellent £102 delivered, when it turned up it said made in Italy on it so it was clearly made in the Magneti Marelli factory where the originals were manufactured.



Be careful when searching for a Range Rover V8 alternator, when Land Rover released the Thor engine (still a Rover V8 but with a different inlet manifold) they also changed the alternator, the mounting arrangement is very different so this alternator will not fit our TVRs. However, while the 100 amp AMR4247G ran for quite some time the dimensionally identical AMR2938E (Denso part no: DAN016) only ran for a year or so making it quite rare, everything I read about the 120 amp AMR2938E said it's a direct swap for the 100 amp AMR4247G with many Range Rovers owners completing this upgrade so I've just followed their lead.

Here's the dimensions of the 120 amp AMR2938E (Denso part no: DAN016)



And by way of a comparison here's the dimensions of the 100 amp AMR4247G (Denso part no: DAN020)



As we can see they are dimensionally identical, only the amp output differs.

I've been running the the £102 AMR2938E 120 amp (Denso part no: DAN016) on 'Ol Gasbag' for a number of months now, it fitted perfectly as you'd expect and is providing excellent service so far, it is after all the proper real deal OEM quality original, just with 20 more amps to give should my new LPG injectors demand them.

Hope this helps, Dave.

Edited by ChimpOnGas on Wednesday 23 August 19:07

[2 sMoKiN bArReLs]

ChimpOnGas said:

Sardonicus said:

I personally wouldn't use either of those and especially Britpart I would only use as a paper weight or door stop long term, Chimpongas on these forums did some research using a Denso (great quality alternative) to the standard Magneti Marelli unit which in my opinion is a fine quality unit already.]

The Land Rover part number for the original Magneti Marelli 100 amp alternator fitted all Chimaeras is AMR4247G, you could buy it from a TVR parts specialist but the cost is £153.54 including VAT & delivery and there's no mention of what brand it is, I suspect that means it'll be one of the cheaper makes you could have off EBay for a lot less or they would be shouting about it being a quality brand.

Interestingly I discovered when Land Rover fitted a heated front screen to Range Rovers & Discoveries in 1997/8 they also uprated the alternator from 100 amps to 120 amps, the body dimensions and mounting points of this higher output alternator are exactly the same as our 100 amp AMR4247G alternator making the 120 amp AMR2938E is a direct replacement to AMR4247G.

I wanted a Denso brand alternator, Denso is a quality make you can trust and if you look into it you'll actually find they've owned the Magneti Marelli factory in Italy since 2004 so I started researching how much the Land Rover parts specialists charge for a genuine 120 amp AMR2938E, I got prices ranging from £200 - £150 but eventually found one LR parts specialist selling a genuine Denso brand AMR2938E for £145 including VAT & postage.

Before I pulled the trigger I thought rather than keep Googling 'AMR2938E' I would get Denso's own part number and do a few searches on that, the Denso part number for AMR2938E is DAN016. Searching on DAN016 lead me to an Ebay listing that seemed to be Denso's own Ebay shop.

Here it is....

http://www.ebay.co.uk/itm/NEW-OE-DENSO-DAN016-ALTE...

This 120amp alternator comes direct from Denso who own Magneti Marelli, the price was and still is an excellent £102 delivered, when it turned up it said made in Italy on it so it was clearly made in the Magneti Marelli factory where the originals were manufactured.



Be careful when searching for a Range Rover V8 alternator, when Land Rover released the Thor engine (still a Rover V8 but with a different inlet manifold) they also changed the alternator, the mounting arrangement is very different so this alternator will not fit our TVRs. However, while the 100 amp AMR4247G ran for quite some time the dimensionally identical AMR2938E (Denso part no: DAN016) only ran for a year or so making it quite rare, everything I read about the 120 amp AMR2938E said it's a direct swap for the 100 amp AMR4247G with many Range Rovers owners completing this upgrade so I've just followed their lead.

Here's the dimensions of the 120 amp AMR2938E (Denso part no: DAN016)



And by way of a comparison here's the dimensions of the 100 amp AMR4247G (Denso part no: DAN020)



As we can see they are dimensionally identical, only the amp output differs.

I've been running the the £102 AMR2938E 120 amp (Denso part no: DAN016) on 'Ol Gasbag' for a number of months now, it fitted perfectly as you'd expect and is providing excellent service so far, it is after all the proper real deal OEM quality original, just with 20 more amps to give should my new LPG injectors demand them.

Hope this helps, Dave.

Edited by ChimpOnGas on Wednesday 23 August 19:07

Could you be more specific?

[latham91]

Thanks all - really great advice as usual!

[Hamish]

Hi All,

Sorry for resurrecting this one, but my alternator has just failed (original magnetti from 1996!), and I am considering replacing with a Denso one as listed very nicely above. I am going to go for the 100A one (DAN020).

Whats the current view on these, are they any good? Prices look ok, seem to be around £140.

Cheers!

[ChimpOnGas]

Denso is a long established and hugely respected Japanese manufacturer of quality automotive products, Denso are often the go-to choice of the major car makers who have exacting standards and expectations of their suppliers.

Throughout the 1990's Magneto Marrelli was Land Rover's alternator supplier of choice so it was also what you got when you bought a TVR, in 2000 the mighty Denso corporation purchased a 50% stake in Magneto Marrelli which including the Italian plant that made the original alternator for our cars.

So the bottom line is if you want an OEM standard alternator made in the same factory that produced your original you only have one option... Denso. The new old stock Range Rover alternators sold by Denso (if still available) come with made in Italy on the unit for this reason.

Finally be aware any other brand from the usual Range Rover parts specialists like Britpart are often total junk, it's the same story if you go to a TVR parts specialist... the only difference is you'll just pay more for the unit!

[Hamish]

Brilliant feedback, thanks COG. Just what I needed. Purchase made.

[Hamish]

Just to follow up - fitted it yesterday, very happy with it. Carbon copy of the original, very high quality, the plastic moulding around the connectors still has Magneti Marelli embossed on it and label says made in Italy.

If anyone wants the old one for free for refurb just shout.

I ordered a fan belt from a TVR parts place at the same time, the one that arrived was 1853 rather than 1850 so I put the old one back on in the end. Anyone had any issues with the extra 3mm on the 1853?

[Sardonicus]

Hamish said:

Just to follow up - fitted it yesterday, very happy with it. Carbon copy of the original, very high quality, the plastic moulding around the connectors still has Magneti Marelli embossed on it and label says made in Italy.

If anyone wants the old one for free for refurb just shout.

I ordered a fan belt from a TVR parts place at the same time, the one that arrived was 1853 rather than 1850 so I put the old one back on in the end. Anyone had any issues with the extra 3mm on the 1853?

3mm longer will make no difference whatsoever and will work perfectly

[Hamish]

OK thanks, thought the tensioner would do the job.
Its a Dayco one, but feels flimsier than the original 1850 one.