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Montblanc

Member Since: 10 Feb 2013
Location: Les Houches, Chamonix Valley
Posts: 14

2007 Defender 110 Puma 2.4 XS CSW Zermatt Silver

Master Light Switch

I was driving through the 11km Mont Blanc tunnel yesterday when half way through my lights failed! I was able to switch to side lights but switching back to headlights - nothing.
Today I removed the master light switch and it appeared to have over heated causing the white plastic to soften so the contacts moved out of position slightly. I checked the current demand on headlights and side lights but nothing unexpected (about 9 amps and 3 amps respectively). I have ordered a new switch but I can't explain why the plastic melted. Any Ideas anyone ?

6th Apr 2019 10:56pm

dailysleaze

Member Since: 23 May 2013
Location: United Kingdom
Posts: 237

It's not uncommon to happen. It's partly the reason why people fit bypass/relayed looms, to avoid sending the full current through that switch and incurring the voltage drop

6th Apr 2019 11:03pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4784

It's a very common problem. The switch is running at capacity with the standard headlights. It eventually fails. To solve the problem you need to fit relays to take the load off the headlight switch.

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
Instagram http://www.instagram.com/george_grafton

6th Apr 2019 11:05pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4784

Beat me to it

6th Apr 2019 11:05pm

Montblanc

Member Since: 10 Feb 2013
Location: Les Houches, Chamonix Valley
Posts: 14

Thanks guys.
That's great information, I just couldn't find a fault that would explain the failure so I was worried that I was missing something. I've ordered a new OEM switch and I'll see how it goes. Any further problems and I'll fit a relay kit.
Happy Land Rovering from the land of mountains and snow.

7th Apr 2019 7:31am

bpman

Member Since: 21 May 2008
Location: Oslo
Posts: 8069

2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black

40 years design

7th Apr 2019 8:25am

Montblanc

Member Since: 10 Feb 2013
Location: Les Houches, Chamonix Valley
Posts: 14

Lucas... Prince of Darkness

Character - that's what's missing in modern cars.

7th Apr 2019 8:37am

ericvv

Member Since: 02 Jun 2011
Location: Near the Jet d'Eau
Posts: 5816

2009 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black

Mont Blanc, get the Landreiziger loom too. It will not only avoid another switch failure in the middle of the tunnel, but it will also improve your headlights light production.
Eric You never actually own a Defender. You merely look after it for the next generation.
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https://www.youtube.com/watch?v=ZSixqL0iyHw

7th Apr 2019 8:48am

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

LRJ have mob puma 07 to 2011 re master light switch see link

https://1drv.ms/b/s!AtZSoWFHDgnGkjJVf5vaREsU7XKN

7th Apr 2019 9:30am

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