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boode



Member Since: 11 Apr 2012
Location: Devon
Posts: 430

England 2003 Defender 90 Td5 HT Rutland Red
Electric current where it should not be
When my side/main lights are turned on it crerates a 9v current in the rear brake light wire.
This causes the LED rear brake lights to come on all the time that the side lights are on.
This is not a problem if I had old style bulbs in the circuit as they will not operate at 9v, but the LEDs will come on at this voltage.
I guess that I have water in the wiring some where that is joining the side and brake circuits together - but where?
If the brakes are on (12v in their wire) it does not cause any voltage in the side light wire if the side lights are turned off. So the problem only occurs one way from side to brake , so I do not think it is a direct wire connection.
Is there any anything I can do to solve this or to investigate further ?

At present my options are - replace loom - dont fancy doing this
Run one LED and one Bulb back light - also dont fancy doing this

Any advice appreciated as I am confused
Post #199258 5th Jan 2013 7:55pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
Unfortunately there is no 'quick fix' without fault finding.

Purchase yourself a cheap insulation tester/multimeter and then use the principle of 'split by half method' to find your fault.

http://www.ebay.co.uk/sch/Insulation-Testers-/121877/i.html

Split by half fault finding......

Split half technique is used when fault finding on an electrical circuit. If you have a supply and an earth, you would then check for voltage about half way along the circuit. If you had voltage, you would then pick a point about half way between your present position and earth. You would then repeat with half way of every subsequent half until you had located the fault.

Or if you don't have the inclination 'slave' cable(s) in from the relay to the lights until you find the damaged cable. The slaved in cables need only run for diagnostic purposes from a suitable point (relay is favourite) to the light and does not have to be routed in but can be run outside the vehicle until such time as you diagnose the affected cable(s), then replace as necessary. If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #199263 5th Jan 2013 8:05pm
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noworries4x4



Member Since: 24 Dec 2010
Location: Newton Abbot Devon
Posts: 1195

England 
Do you have a tow pack fitted ? as the 7/13 pin sockets fill up with water from the back wheels and cause alsorts of problems If everything is under control you are not going fast enough.

Every Day 16 MY Discovery 4 Commercial Workshop and Escort Vehicle
Weekends 07MY L322 TDV8 Vogue SE
Series 1 80" 3ltr 6cyl with overdrive
No Worries 4X4
Post #199271 5th Jan 2013 8:30pm
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boode



Member Since: 11 Apr 2012
Location: Devon
Posts: 430

England 2003 Defender 90 Td5 HT Rutland Red
Thanks noworries I will check the towing electrics first - I did drive through a puddle 3 feet deep so lots water everywhere
If not I will try the split by half method
Post #199274 5th Jan 2013 8:35pm
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noworries4x4



Member Since: 24 Dec 2010
Location: Newton Abbot Devon
Posts: 1195

England 
Ahhh WD40 on standby then, wash the plug out with it. If everything is under control you are not going fast enough.

Every Day 16 MY Discovery 4 Commercial Workshop and Escort Vehicle
Weekends 07MY L322 TDV8 Vogue SE
Series 1 80" 3ltr 6cyl with overdrive
No Worries 4X4
Post #199275 5th Jan 2013 8:40pm
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ibexman



Member Since: 13 Dec 2008
Location: Essex
Posts: 2945

United Kingdom 
I had this problem last year in damp weather i think the bulbs were arcing to earth it went away in the dry weather Thumbs Up
Post #199284 5th Jan 2013 9:17pm
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boode



Member Since: 11 Apr 2012
Location: Devon
Posts: 430

England 2003 Defender 90 Td5 HT Rutland Red
Just stripped the tow socket and problem cured - Thankyou noworries4x4
Now I need to find a waterproof 7 pin socket

Thanks for the advice
Gavin
Post #199336 6th Jan 2013 9:04am
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kingofthesparks



Member Since: 06 Jan 2011
Location: Very close to Watford gap services , northants
Posts: 987

United Kingdom 2012 Defender 90 Puma 2.2 HT Fuji White
Mount it higher up Thumbs Up
Post #199368 6th Jan 2013 11:53am
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Merlin



Member Since: 30 Oct 2010
Location: Newmarket
Posts: 981

United Kingdom 
The genuine Land Rover part is a sealed unit (filled with some sort of resin), so no chance of water causing this problem.

Merlin
Post #199380 6th Jan 2013 12:57pm
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kingofthesparks



Member Since: 06 Jan 2011
Location: Very close to Watford gap services , northants
Posts: 987

United Kingdom 2012 Defender 90 Puma 2.2 HT Fuji White
Merlin wrote:
The genuine Land Rover part is a sealed unit (filled with some sort of resin), so no chance of water causing this problem.

Merlin


If its that well sealed how do you put a plug into it, oh that's the weak point Rolling with laughter
Post #199433 6th Jan 2013 4:54pm
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