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The Fox



Member Since: 24 Mar 2014
Location: Shrewsbury
Posts: 94

United Kingdom 2014 Defender 90 Puma 2.2 XS CSW Corris Grey
Internal Live Feed Question
I'm in the process of installing an internally-routed LIVE feed from the battery to the fusebox.

Is there any reason Why i can't/shouldn't connect up the new feed as well as leave the existing one in place. I can't think of a reason - but thought it best to check and see if someone has had an explosive experience which I should learn from!!
Post #813911 6th Feb 2020 3:03pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
I can think of two reasons:

1. It's quite crowded at the fuse box end and two connections may not fit.
2. If somebody does cut the cable under the seatbox, you're left with two live bare ends floating around, which is less than ideal. Particularly so if they're left and you don't know about it. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

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Post #813922 6th Feb 2020 3:54pm
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
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United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
I have run a second set of cables. Only small gauge, but rated enough to power all of my security. Its fused so if the cables underneath are chopped and I go to start it then it will blow the fuse and I can start to investigate.

Also if they do chop the cables underneath they'll get a bit of a shock when all the security still works Twisted Evil 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
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Post #813927 6th Feb 2020 4:45pm
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90 Dreamer



Member Since: 13 Jul 2019
Location: Oop North
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United Kingdom 2016 Defender 90 Puma 2.2 HT Corris Grey
Can you not just wire it so they stay live when hacked and give them a belt hopefully......... Laughing
Post #813953 6th Feb 2020 7:19pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
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United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
The only downside I can see for leaving the old is the significant fire risk of cut live ends dangling underneath. It'd be a shame to deter the thief only to have the vehicle incinerate itself.
Post #813962 6th Feb 2020 7:46pm
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
Would the main fuse not blow with the enormous current draw? 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
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Post #813968 6th Feb 2020 8:10pm
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macfrank



Member Since: 05 Nov 2015
Location: somewhere in the north
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Germany 2015 Defender 110 Puma 2.2 SW Keswick Green
grafty99 wrote:
Would the main fuse not blow with the enormous current draw?


There is no fuse in the live feed from battery to fuse box!
A serious omission in my view. A fuse is still on my to do list... Whistle

I think Darren's reason #2 is justified. Even if you put fuses at both ends, they would have to be >>60 Amps - maybe enough to cause a fire underneath due to fuel, oil, ...
Post #813988 6th Feb 2020 9:34pm
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Martin
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Member Since: 02 Apr 2007
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United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
If you want to leave the original cable in place so it appears that you haven’t moved it, just disconnect both ends?  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #813993 6th Feb 2020 10:00pm
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
macfrank wrote:
grafty99 wrote:
Would the main fuse not blow with the enormous current draw?


There is no fuse in the live feed from battery to fuse box!
A serious omission in my view. A fuse is still on my to do list... Whistle

I think Darren's reason #2 is justified. Even if you put fuses at both ends, they would have to be >>60 Amps - maybe enough to cause a fire underneath due to fuel, oil, ...


I'm pretty sure all 2007 onwards defenders have a 500A fuse on the battery terminal?

But as Martin suggested, leaving them in place disconnected might be a good idea. I think it would make them believe they'd disarmed the alarm, only to get a surprise when they open a door/bonnet and it goes off. Might be enough to spook them or at least alert the owner Thumbs Up 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
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Post #814001 6th Feb 2020 10:43pm
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The Fox



Member Since: 24 Mar 2014
Location: Shrewsbury
Posts: 94

United Kingdom 2014 Defender 90 Puma 2.2 XS CSW Corris Grey
Cheers all.

Fitted but disconnected sounds like the way to go.
Post #814013 7th Feb 2020 8:16am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
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United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
It's easy to set fire to a vehicle without blowing even a 60 Amp fuse. A 500 Amp megafuse isn't really a lot of use for protection since things will be really, really bad long before it blows.

You could always fit an extra alarm connected to the redundant exposed link cable that triggers if it is cut.
Post #814021 7th Feb 2020 9:21am
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macfrank



Member Since: 05 Nov 2015
Location: somewhere in the north
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Germany 2015 Defender 110 Puma 2.2 SW Keswick Green
grafty99 wrote:
macfrank wrote:
grafty99 wrote:
Would the main fuse not blow with the enormous current draw?


There is no fuse in the live feed from battery to fuse box!
A serious omission in my view. A fuse is still on my to do list... Whistle

I think Darren's reason #2 is justified. Even if you put fuses at both ends, they would have to be >>60 Amps - maybe enough to cause a fire underneath due to fuel, oil, ...


I'm pretty sure all 2007 onwards defenders have a 500A fuse on the battery terminal?

But as Martin suggested, leaving them in place disconnected might be a good idea. I think it would make them believe they'd disarmed the alarm, only to get a surprise when they open a door/bonnet and it goes off. Might be enough to spook them or at least alert the owner Thumbs Up


The live feed is NOT connected to the 500A fuse! The wire goes off the battery terminal before the fuse.
The 500A is only for the starter/alternator feed.



Click image to enlarge



But anyway, leaving the original feed disconnected seems the way to go.
Or you could even use it to trigger something when cut... silent alarm message, siren, blinding lights, tear gas... Whistle
(edit: just saw blackwolf had the same idea Smile if not as drastic Smile )
Post #814024 7th Feb 2020 9:43am
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The Fox



Member Since: 24 Mar 2014
Location: Shrewsbury
Posts: 94

United Kingdom 2014 Defender 90 Puma 2.2 XS CSW Corris Grey
blackwolf wrote:
It's easy to set fire to a vehicle without blowing even a 60 Amp fuse. A 500 Amp megafuse isn't really a lot of use for protection since things will be really, really bad long before it blows.

You could always fit an extra alarm connected to the redundant exposed link cable that triggers if it is cut.


This has got me thinking - I could fuse the old feed at 0.5A and fit a normally-closed relay in series to a battery-powered siren which charges from this circuit. Cut the under-vehicle cable = 120db of noise...
Post #814703 12th Feb 2020 9:39am
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X4SKP



Member Since: 29 Nov 2013
Location: Berkshire
Posts: 2295

United Kingdom 2010 Defender 90 Puma 2.4 SW Stornoway Grey
Martin wrote:
If you want to leave the original cable in place so it appears that you haven’t moved it, just disconnect both ends?


Exactly… Thumbs Up I know 'someone' who has done exactly this Cool

Why this is good, I would argue the best route even if using the security kit and not a DIY approach
is that if you are a victim of this design failure by JLR Embarassed and the cable is in place where expected
then is cut... this may help with ensuring the alarm is triggered when entering. SKIP
https://www.defender2.net/forum/topic83242.html
Post #814704 12th Feb 2020 9:55am
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macfrank



Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1076

Germany 2015 Defender 110 Puma 2.2 SW Keswick Green
The Fox wrote:
blackwolf wrote:
It's easy to set fire to a vehicle without blowing even a 60 Amp fuse. A 500 Amp megafuse isn't really a lot of use for protection since things will be really, really bad long before it blows.

You could always fit an extra alarm connected to the redundant exposed link cable that triggers if it is cut.


This has got me thinking - I could fuse the old feed at 0.5A and fit a normally-closed relay in series to a battery-powered siren which charges from this circuit. Cut the under-vehicle cable = 120db of noise...

Thumbs Up
Plus this: https://translate.google.de/translate?sl=d...em-Furie-5
Twisted Evil
Post #814835 12th Feb 2020 9:29pm
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