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JustFX



Member Since: 10 Nov 2016
Location: Mendip Hills
Posts: 190
United Kingdom 2000 Defender 110 Td5 CSW Coniston Green
TD5 Headlight fun
Today I have been having to work on my Boss's 90.

He has LED headlights and the dipped beam keeps turning off.

I swapped the main headlight switch a few weeks back, and that didn't change anything. The fault is intermittant (the best kind).

So I went out with a multimeter and...

Engine Running lights on dipped,
Headlights = 8V
Fuse = 8V

Engine off but ign on,
Headlights = 8V
Fuse = 8V

Not enough to run the 12v for the headlights so hence the failure. The LED was fitted as the headlights were crap hmm.

Not with the engine running I took the Relay out for main beam that sits in the fuse box, then
Headlights 13V
Fuse 13V

Put relay back in and I am still getting 13V. Now could the relay be at fault...could it be sticking? 
Post #675391 3rd Jan 2018 1:40pm
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4788
United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
Could be a relay fault, but also worth checking earth points as well Thumbs Up 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
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Post #675399 3rd Jan 2018 1:57pm
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JustFX



Member Since: 10 Nov 2016
Location: Mendip Hills
Posts: 190
United Kingdom 2000 Defender 110 Td5 CSW Coniston Green
Even when it was only putting out 8V the earth was still good to the chassis. The Fuse was tested but earthing to the shield so again that seems OK. I think it may have a moused wire in there and I can't find it yet. 
Post #675404 3rd Jan 2018 2:33pm
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2250
United Kingdom 1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey
Sounds like dirty/corroded relay contacts to me. Are the lights better now ?
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey
Post #675408 3rd Jan 2018 2:54pm
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JustFX



Member Since: 10 Nov 2016
Location: Mendip Hills
Posts: 190
United Kingdom 2000 Defender 110 Td5 CSW Coniston Green
They work now, but the fault was intermittent but a shaking of wires etc hasn't caused it to fail yet.

I have also bypassed the DimDip relay just incase that is having issues as well. 
Post #675413 3rd Jan 2018 3:05pm
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