Reply With QuoteI have put a V8 3.9 disco one on a 300 Tdi in the past. They are a 100amp alternators. Will got straight in
Master
Hi
I have a 1994 300TDi Defender. The alternator is only putting out 12.5 volts and doesn’t seem to be giving the batteries a good charge.
I am looking into replacing the alternator and have had some different answers from various suppliers.
I have also been reading a few threads on this subject and have a few questions.
1: I am told that the 65 Amp (A127-65) is standard, and that if I fitted the 100 Amp (A127-100) from a Discovery it wouldn’t have any warranty by one supplier, only to have another supplier tell me that the 100 Amp is the standard.
2: I have read that there is a Bosch alternative but I can’t seem to find any information about it. Does anyone know the part number?
3: I have 2 AGM batteries which I am told can take a very high initial charge rate. Is it worth getting the higher amperage on?
4: Does anyone have any details/opinions regard going for the OEM or aftermarket.
Thanks in advance
Craig
TopicToaster
I have put a V8 3.9 disco one on a 300 Tdi in the past. They are a 100amp alternators. Will got straight in
95 300 Tdi Defender 90
99 300 Tdi Defender 110
92 Discovery 200tdi
50 Series 1 80
50 Series 1 80
www.reads4x4.com
ChatterBox
As I understand it.
The 65 amp a127 is standard on the Defender TDi
The 100 amp a127i is standard on the Disco TDi
The reasoning for this, so I have been told, is because the Disco has more electronic/electical gadgets than the Defender.
Can't see how fitting a 100amp would interfer with warranty, especially as the parts catalogue list a 100 and a 120 amp as alternatives.
Wizard
Originally Posted by Reads90
Don't the diesel alternators also have a vacuum pump on the back for the brakes??
TopicToaster
No
Well not mine anyway.
1st did it with my 200 Tdi 90 challenge truck. Put a 3.9 V8 alternator on. But just changed the serpentine pulley for the old 200 Tdi v belt pulley. Easy job doen and then twice the power
95 300 Tdi Defender 90
99 300 Tdi Defender 110
92 Discovery 200tdi
50 Series 1 80
50 Series 1 80
www.reads4x4.com
Swaggie
I have a 100 amp alt of a transit van on my defender if you want a part number let me know and ill post it
ForumSage
No, the vacuum pump on a Tdi is mounted to the drivers side of the engine and is driven off the camshaft.
The TD5 alternator has a vacuum pump on the back.
Swaggie
Confirming that the Disco 300Tdi alt will fit and is a 100 to 120 Amp unit. It is also of better quality and is rebuildable properly, as the A127 65 amp defender one is a throw away when the rear bearing fails.
JC
RoverLord
12.5v is too low unless your trying to draw say 110-115% of rated amps...
might be an easy fix with a dodgy internal regulator...
the the v8 3.9l atlernator bolts onto a tdi20o IVe done that once but thats as far as I go..
Dave
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YarnMaster
The 100Amp unit is an optional fit for the 300TDi Defender, no modifications needed. My truck has the 100Amp unit.
As for charge... The alternator should be putting out approx 13.8v IIRC.
M
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