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Looking for 12V switched in roof
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Yabba
 


Member Since: 23 Aug 2016
Location: Laakdal
Posts: 12

Belgium 2005 Discovery 3 TDV6 SE Manual Zambezi SilverDiscovery 3
Looking for 12V switched in roof

Is there a 12v switched available (only on when ignition is on) somewhere behind the front interior light dome ?

I'm installing a 12v camera in front of the rearview mirror and would like to take off 12 volt not too far away...
  
Post #201724110th Jan 2019 6:45 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10336

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

maybe

green wire on the rain sensor
  
Post #201724710th Jan 2019 7:08 pm
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OldPOP
 


Member Since: 15 Apr 2017
Location: Newbury
Posts: 116

United Kingdom 2005 Discovery 3 TDV6 SE Manual Unknown ColourDiscovery 3

If you lift the cover on the driver's side A pillar there is a good selection of feeds that you can use - its an easy route up to the interior light cluster which is where I added a switch so that I can go from automatic when in reverse to always on so that I can check the trailer load when towing

https://www.disco3.co.uk/forum/adding-addi...68478.html


  
Post #201726510th Jan 2019 7:57 pm
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garrycol
 


Member Since: 06 Dec 2010
Location: Canberra
Posts: 1114

Australia 

Short answer is no - either switches on then off or constant power with switching after the electrical item (I think sensors are like this).

I had to run a power lead from the fuse box behind the glove box up the pillar then across to the center light where I have a USB connection to run my dash cam.

Garry
  
Post #201738510th Jan 2019 11:31 pm
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ibruceuk
 


Member Since: 20 Mar 2018
Location: Lancashire
Posts: 105

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Yes, in the front light cluster there is a wire that is live when the vehicle is awake. I've used it for my dash cam (it's also quite interesting to note how often the vehicle wakes up for 2 minutes through the night.)

Can't remember which it is off the top of my head though! Basically it's the power feed for the map lights as these only work when the car is "awake".
  
Post #201739611th Jan 2019 12:10 am
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

I used a wire up behind the rear view mirror cover, only downside is the camera dies as you put it into reverse and sometimes has to be manually powered up by pressing the on button, the rest of the times it comes on and off with the ignition.

I think its the feed for the auto dimming rear view mirror, but it was a few years ago when I fitted it.

If I was doing it again I would go down to the fuse box as one day the camera wont fire up after reversing and I will forget to restart it and thats the day Im going to have an accident!

You can get nice and neat piggy back fuse holders so dead easy to fit into a fuse slot.
  
Post #201743111th Jan 2019 8:47 am
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garrycol
 


Member Since: 06 Dec 2010
Location: Canberra
Posts: 1114

Australia 

ibruceuk wrote:
Basically it's the power feed for the map lights as these only work when the car is "awake".


I thought they worked at any time (well mine do) and have a constant 12v feed not a switched 12v feed.

I looked right into this when I did mine and could not find and wires up there that were a simple switched 12v so that power was only supplied when ignition was on. That is why I ended up going to a piggy back fuse from the main fuse box - I think the fuse for the centre console 12v socket but I cannot remember.

Garry
  
Post #201774412th Jan 2019 2:36 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10336

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

The reading lights get shut off when the car is locked/alarmed. So they maybe of use.

Rain sensor or rear view mirror sound good options for ignition supply.

Rear view mirror green wire with red stripe seams the best choice. (ignition II)
Rain sensor green wire can also be used. (ignition I)

come via 5A fuses (69,18) so suitable for direct connection to a camera
 

Last edited by Pete K on 9th Feb 2019 3:52 pm. Edited 1 time in total 
Post #201779612th Jan 2019 9:16 am
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garrycol
 


Member Since: 06 Dec 2010
Location: Canberra
Posts: 1114

Australia 

Are you sure? When I tested those I found they had permanent 12v with the switching done on the negative side - but it is a long time since I played with all this.
  
Post #201783012th Jan 2019 10:59 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
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England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

99% sure.

The OP can try and let us know
  
Post #201788012th Jan 2019 2:15 pm
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JackNorris
 


Member Since: 06 Jul 2012
Location: Beds/Bucks Border
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United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Tonga GreenDiscovery 3

Picky back fuse in the fuse box behind glove box - much easier
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Post #201788712th Jan 2019 2:56 pm
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Yabba
 


Member Since: 23 Aug 2016
Location: Laakdal
Posts: 12

Belgium 2005 Discovery 3 TDV6 SE Manual Zambezi SilverDiscovery 3

I am going the piggy back way, but will test the other option also, just to know for sure Wink
  
Post #201819013th Jan 2019 12:47 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10336

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

It's extra work going across the sun visors, down the A pillar.
They get in the way when trying to change other fuses
  
Post #201820513th Jan 2019 2:00 pm
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philm
 


Member Since: 02 Oct 2016
Location: Manchester
Posts: 732

England 

Pete K wrote:
99% sure.

The OP can try and let us know


100%. I've done it but can't remember which colour wire.
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Post #201820613th Jan 2019 2:07 pm
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coupequattro
 


Member Since: 03 May 2012
Location: N. California
Posts: 4

United States 2006 LR3 4.4 V8 SE Auto Unknown ColourLR3
Re: Looking for 12V switched in roof

Yabba wrote:
Is there a 12v switched available (only on when ignition is on) somewhere behind the front interior light dome ?

I'm installing a 12v camera in front of the rearview mirror and would like to take off 12 volt not too far away...


There is a green/white wire on a 4 pin connector that plugs into the dome light that powers up when the car unlocks and turns off when it locks or powers down after a given time after the ignition is turned off.



Later
Aidan
  
Post #202384431st Jan 2019 7:12 am
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