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ozzie1989



Member Since: 25 Feb 2009
Location: Wales
Posts: 282
Wales 2010 Defender 110 Puma 2.4 USW Bonatti Grey
Fog Light Relay
Hi all, I always thought the fog light relay under the driver seat on my TDCi was to stop the fog light on the vehicle from activating when towing a trailer.

I've recently bought a trailer but the fog light still comes on along with the one on the trailer. Do I have a faulty relay or did I just imagine it was supposed to do this? Rolling Eyes Now: 2010 2.4 TDCi 110 Utility Wagon
Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition)
Post #716735 8th Jul 2018 3:58pm
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zsd-puma



Member Since: 09 Aug 2016
Location: Kent
Posts: 2720
United Kingdom 2010 Defender 110 Puma 2.4 USW Santorini Black
The relay is to allow the use of a non-latching switch, and so the rear fog light only comes on when the lights are on and it'll switch off when you switch off the ignition.

Fog light (and reverse light) cut out is usually a feature of the towing kit, some car wiring kits have it some don't. I think the genuine wiring kit has a spare plug on it to allow this function to be wired up.
Post #716804 8th Jul 2018 10:29pm
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ozzie1989



Member Since: 25 Feb 2009
Location: Wales
Posts: 282
Wales 2010 Defender 110 Puma 2.4 USW Bonatti Grey
Of course! Doh! Whistle

Should have know that! My towing kit is genuine but obviously hasn't been wired in this way. Will take a look. For now it's not a major issue as I don't tend to use the fog light more than once a year anyway.

Cheers ZSD Bow down Now: 2010 2.4 TDCi 110 Utility Wagon
Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition)
Post #716809 8th Jul 2018 10:46pm
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zsd-puma



Member Since: 09 Aug 2016
Location: Kent
Posts: 2720
United Kingdom 2010 Defender 110 Puma 2.4 USW Santorini Black
To be honest though if you're towing infrequently, you can just take the bulb out of the rear fog light. And put it back when you take the caravan off. Wink
Post #716813 8th Jul 2018 11:05pm
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