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west4x4



Member Since: 23 Jan 2010
Location: Rutland
Posts: 140

United Kingdom 
Ignition live
Where’s best to take an ignition live? I’ve a few electrical upgrades to make and want some only working with the ignition on.

300Tdi station wagon
Post #1010786 10th Oct 2023 7:40pm
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MartinK



Member Since: 02 Mar 2011
Location: Silverdale (Lancashire/Cumbria Border)
Posts: 2665

United Kingdom 2011 Defender 110 Puma 2.4 USW Orkney Grey
I would suggest the radio (that's what I have) or the cigarette lighter... You'll need a relay (depending of load you are connecting) of course Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's)
Post #1010821 11th Oct 2023 6:29am
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

United Kingdom 
As above. What are you planning on fitting that needs an Ign. Live? and where are you fitting it, cabin, engine bay??
Post #1010826 11th Oct 2023 7:45am
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MartinK



Member Since: 02 Mar 2011
Location: Silverdale (Lancashire/Cumbria Border)
Posts: 2665

United Kingdom 2011 Defender 110 Puma 2.4 USW Orkney Grey
I did consider something like a Healtech Thunderbox. Used a lot in other applications. Basically it cuts off at ~12.5v, but switches on when the vehicle is making enough power for "charging" (about 14v I assume).
https://www.healtech-electronics.com/products/tb/

Also if you have CANBUS or similar it's less likely to cause a fault... Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's)
Post #1010850 11th Oct 2023 9:57am
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west4x4



Member Since: 23 Jan 2010
Location: Rutland
Posts: 140

United Kingdom 
Heated screen and seats is the plan plus a feed to a 13 pin tow socket
Post #1011165 13th Oct 2023 7:37pm
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Mossberg



Member Since: 29 Feb 2020
Location: Lancs
Posts: 553

United Kingdom 1993 Defender 90 300 Tdi HT Aintree Green
I am no electrician but looking at your requirements perhaps a separate fuse box fed via a relay may be an option as I could see that lot taking quite a lot of amps.

I think this will need to be done right or you could create quite a dangerous situation (thinking wiring fire here).
Post #1011168 13th Oct 2023 8:08pm
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west4x4



Member Since: 23 Jan 2010
Location: Rutland
Posts: 140

United Kingdom 
Yes wanting the ignition live to switch a relay to the seats/screen. The same would work for the feed to the trailer. Just wanting to pick up a source that’s not piggybacking off something else
Post #1011169 13th Oct 2023 8:16pm
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NickMc



Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1628

Northern Ireland 2006 Defender 90 Td5 HT Bonatti Grey
I’d fit a separate fuse box or buy the correct kit off https://www.mobilecentre.co.uk/
Post #1011175 13th Oct 2023 9:19pm
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DC101



Member Since: 01 Jul 2012
Location: Pudsey, West Yorkshire
Posts: 260

United Kingdom 2003 Defender 110 Td5 DCPU Epsom Green
Apologies. Hope I’m not hijacking this thread, but considering doing something similar, so thought it the best place to post.

I want to take power off the main battery, but only when ignition is live.
To charge a portable power bank.
Am I thinking along the right lines:-
Wire from ignition live (‘lighter’ socket) to a relay in battery box
Power from battery to relay;
Lead from relay to fuse box to power outlet.

Any relay suggestions - no huge currrent draw.
With thanks

Rob





Cheers

Rob
Post #1011685 18th Oct 2023 3:45pm
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DSC-off



Member Since: 16 Oct 2014
Location: North East
Posts: 1428

United Kingdom 2015 Defender 110 Puma 2.2 XS CSW Aintree Green
Hi,
It sounds like you want something similar to a split charge system I built.
This was done with small voltage sensing relay, no need to pickup an ignition live.
You'd probably move the relay to before the plug, so it's permanently in the landrover, not in the battery box.
A switch in the ground wire of the relay would allow an over ride to turn it off when power at the socket isn't required.

https://www.defender2.net/forum/topic83243...y+charging
Post #1011690 18th Oct 2023 4:37pm
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