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D4and LED trailer lights
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JeffD4
 


Member Since: 25 Dec 2009
Location: Perth, Western Australia
Posts: 77

Australia 2010 Discovery 4 3.0 TDV6 SE Auto Alaska WhiteDiscovery 4
D4and LED trailer lights

Something curious; have been towing my boat with LED trailer lights now for 2 years with no problems, apart from the in dash trailer symbol not illuminating. This morning connected the boat up; stop lights and lights working OK, but when I use the left indicator, it flashes, but so too does the right one, albeit more dimly. Same happens when I select the right indicator; the left flashes with it but at a lower illumination. When I put my D1 on the boat trailer all is perfect. And when I put my D4 on my camper trailer, which is non LED, all is fine there too. Am taking to the dealer next week, but wondered if anyone has any ideas or similar experience? Very Happy
 Land Rover Series IIA 1967
Discovery 300 Tdi 1998 (white, ARB bullbar, suspension lift, roof rack, Lightforce spots etc)
Discovery 4 3.0 Litre White, e-diff 
 
Post #12303604th Feb 2014 8:06 am
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rodneydisco3
 


Member Since: 13 Sep 2009
Location: High Wycombe
Posts: 113

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Loire BlueDiscovery 4

My view is a poor earth I'm the trailer. Either the plug or one of the light mountings. It could be the LED but I would check earths first. LR did, may still do, a different lighting kit for LED trailer lights.
Hope it is a simple fix.
 Rodey L

2018 Discovery 5 3L HSE Idris silver and black
14MY liore Blue/Almond HSE (now with new custodian)
Discovery 3 09MY Gaulway Green/Almond (now with new custodian)
1933 MG J2
1934 MG PA
1935 MG PB 
 
Post #12303934th Feb 2014 9:16 am
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lr101fc
 


Member Since: 03 Jan 2012
Location: Wales
Posts: 49

Wales 2005 Discovery 3 4.4 V8 HSE Auto Tangiers OrangeDiscovery 3

Hi Jeff,

Yes sounds like a bad earth, the indicator is earthing through the other bulb and then to earth. Worth checking the car and trailer electrics, especially the plug and socket connections. A narrow wire brush like a bottle brush is good for cleaning the plug and socket contacts
 MY05 Discovery 3 G4 LRG4C-14 Stage 3 & 4 Bolivia Team Fleet 49
05HF95 Trailer 3/4 Ton 2 WHD
31FK70 Truck, Utility, 1/2 Ton, 4x4, LHD, Rover Series 1
69ER52 Truck, GS, 1/4 Ton, 4x4 Rover 8
75FL40 Truck, GS, 24v w/winch 1T 4x4 LHD Launcher Towing Rapier Rover 
 
Post #12304774th Feb 2014 12:20 pm
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JeffD4
 


Member Since: 25 Dec 2009
Location: Perth, Western Australia
Posts: 77

Australia 2010 Discovery 4 3.0 TDV6 SE Auto Alaska WhiteDiscovery 4

Turns out nothing wrong with D4 or trailer. This is a well known issue which is corrected by a resistor/converter between car and trailer or a simple home fix. There is plenty on the Australian Land Rover Owners site and this one about the issue. I bought the converter and all is perfect now, including the car recognising the trailer. Very Happy
 Land Rover Series IIA 1967
Discovery 300 Tdi 1998 (white, ARB bullbar, suspension lift, roof rack, Lightforce spots etc)
Discovery 4 3.0 Litre White, e-diff 
 
Post #124267625th Feb 2014 12:06 pm
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pbhawkin
 


Member Since: 14 Dec 2006
Location: Mudgee
Posts: 377

Australia 2013 Discovery 4 3.0 SDV6 HSE Auto Loire BlueDiscovery 4

Er, I thought the 'well known issue' was for Discoverys that do not have LEDs themselves when attaching a trailer that does.
I thought that if the disco had LEDs and the trailer did then there was NO problem!
The converter stops the signal that the Disco sends for a bulb check and if the trailer has LEDs it gets in a 'tiz' and causes the LEDs on the trailer to slowly flash at a reduced brightness (on my old D3 it did anyway).
I have yet to hook up my D4 (with factory LEDs) to the trailer though!!
 regards
Peter
__________________________________________
Oct 2013 SDV6 3.0 HSE.
2007 TDV6 SE E-diff, adaptive lights sold 1/2014 
 
Post #124310325th Feb 2014 10:59 pm
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RetiredBob
 


Member Since: 23 Feb 2006
Location: New South Wales
Posts: 183

Australia 2005 Discovery 3 TDV6 HSE Auto Chawton WhiteDiscovery 3

Hope to find out the answer in the next few days when I pick up my new D4.

One of the first things I will do is hook up to the Van to see how it works.

My old D3 had the first production line (I think) shunt from Lab Electronics. No problems with it over the last eight years.
 Retired Bob
2005 Disco 3 HSE TDV6 (Dual Battery, Snorkel, Nudge Bar, Kaymar Spare Wheel Carriers, Long Ranger Aux Tank. LED Shunt, Centre Console Cooler, New Tail Shaft, New Gear Box, Rigged for towing) Towing Trakmaster Van as often as possible 
 
Post #124310725th Feb 2014 11:07 pm
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Redback
 


Member Since: 19 Jun 2011
Location: Helensburgh NSW
Posts: 40

Australia 2011 Discovery 4 TDV6 Base 7 Seat Auto Orkney GreyDiscovery 4

The D4 and LEDs isn't as bad as the D3, the D4 only needs a resistor, not one of those Lab Electronics gismos, plenty of info on this on AULRO.

Baz.
 2011 Discovery 4 TDV6 2.7l
Redback Country Camper Trailer
1973 Kawasaki H2 750 Triple
2002 TTR250 Yamaha
We swear by the Southern Cross to stand truly by each other and fight to defend our rights and liberties.
Peter Lalor 
 
Post #12475094th Mar 2014 11:07 pm
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