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TD5_90



Member Since: 02 Apr 2011
Location: Perthshire
Posts: 89
United Kingdom 1999 Defender 90 Td5 CSW Epsom Green
Do I need a new alternator?
Hi

As per title, is it the alternator at fault?

Began having starting problems, a couple of slow starts.

Then it wouldn't start after sitting for 20 mins. Got going with a push start (roll down hill)

Wouldn't start again with the symptom of fuel pump relay clicking. Swapped relay for a known good and same clicking. Put my relay in another td5 and it starts.

Tried different batteries but same symptoms. Not brand new but at least one known good one.

Put an extra earth from battery to engine block but no difference.

Put a booster on the battery and it will start but leave running and after 20 mins it cut out.

Multimeter shows voltage dropping: 12+ at start up and instead of increasing to 14+ it steadily drops. Faster with lights, fan etc.

What do you think, Is it the alternator or something else?

Thanks in advance
Richard
Post #250570 10th Jul 2013 8:42pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5423
2006 Defender 110 Td5 USW Zermatt Silver
Sounds like alternator.

Andy
Post #250634 10th Jul 2013 11:09pm
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johnszs



Member Since: 16 Aug 2010
Location: Hereford
Posts: 459
United Kingdom 2004 Defender 90 Td5 XS CSW Alveston Red
Sounds like a voltage regulator or rectifier problem 2004 TD5 Defender 90 xs station wagon
Post #250681 11th Jul 2013 9:02am
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TD5_90



Member Since: 02 Apr 2011
Location: Perthshire
Posts: 89
United Kingdom 1999 Defender 90 Td5 CSW Epsom Green
johnszs wrote:
Sounds like a voltage regulator or rectifier problem


Is that part of the alternator? Or a separate unit?

Thanks
Post #251934 17th Jul 2013 5:39pm
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