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adeparko



Member Since: 13 Feb 2015
Location: West Lothian
Posts: 41

Scotland 2007 Defender 90 Td5 HT Sumatra Black
Battery light on dash
My wife has just phoned to say the battery light is staying lit on the dash

Just wondering what to check? Assume battery light usually points to alternator?

Only problem is cant get access to the battery quickly with the seats being aftermarket. If I put my meter on the output stud of the alternator I take I should be seeing 14V+ there?

Thanks
Post #619461 25th Apr 2017 5:08pm
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1763

United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
Correct on 14V or so, mine tends to sit a bit lower than that when warm. Careful of moving parts, and make sure you are testing to a decent ground point, I find you need to scratch around on the block at times to get one!!

Mike
Post #619462 25th Apr 2017 5:17pm
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4RF RDS



Member Since: 19 Jul 2015
Location: Ottawa
Posts: 933

Canada 2000 Defender 110 Td5 XS CSW Epsom Green
As said above, correct and good advice... Its probably your rectifier or it needs servicing. You can get kits on ebay to repair it. 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)
Post #619560 26th Apr 2017 12:59am
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
You don't need to measure near the engine. You can take the fuse cover off and measure there if that is easier. My 90 td5 produces 14,1 V normally without any electrics switched on. It is not a steady signal most voltmeters don't react that quickly so you see a steady 14V but in fact it fluctuates between 13 and 14V. Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #619574 26th Apr 2017 6:38am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17378

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
A fairly common problem on the TD5 is for the vacuum pump mounted at the front of the alternator to leak oil into the alternator itself, causing it to fail.

Since the alternator/vac pump is only available as a single assembly, there isn't a great deal you can do about this except replace the entire unit.

It is also common on high mileage engines for the the slip rings and brishes to wear excessively. Again, it doesn't seem possible to buy replacement slip rings for these alternators (at least, I can't find any) so replacement is really the only option.
Post #619586 26th Apr 2017 7:47am
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8026

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
it could be a snapped ancil belt, which means coolant not been circulated. check under bonnet first, assuming you have not seen vehicle?

if belt is good then as above. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #619617 26th Apr 2017 10:15am
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Nutter



Member Since: 15 Sep 2014
Location: Birchington
Posts: 25

England 
Make sure your brake lights work as battery light on same fuse i believe.

James
Post #619633 26th Apr 2017 12:12pm
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