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jayaway44

Member Since: 04 Nov 2011
Location: Edinburgh
Posts: 111

2012 Defender 110 Puma 2.2 USW Stornoway Grey

Battery wire size

Can someone please tell me what gauge of wire is used for the negative feed on a TDCi. I would like to change the connector on the negative terminal as it has the silliest of connections on there that means I cannot add another cable onto the terminal. I am not at home at the moment or I would just go out and measure it but i would like to get the materials ordered so it is sitting waiting for me to install when I get home.
Looking at the connection it looks like i will just have to chop the old one off and put on a crimp with an 8mm hole for the new terminal I shall fit, that is unless somebody has a better idea.

Thanks 2.2 2012 110 utility Orkney Grey
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18th Feb 2013 7:18pm

ethanicus

Member Since: 11 Jan 2013
Location: Surrey
Posts: 94

2014 Defender 90 Puma 2.2 XS CSW Corris Grey

I also had this issue when I wanted to add a Blue Sea Aux fuse box. I didn’t want to cut the terminal, but if you did I believe a 35mm2 terminal is required.

In the end I removed the current T style bolt and replaced with a longer ss bolt (m6 from memory). I simply ground down the head to match the existing bolt. Refitted as normal then used a spring washer and nut to secure a M6\16mm2 terminal as per below.

Hope that helps?

Click image to enlarge

18th Feb 2013 8:58pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8018

2011 Defender 110 Puma 2.4 USW Stornoway Grey

35mm is std i believe Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

18th Feb 2013 9:03pm

jayaway44

Member Since: 04 Nov 2011
Location: Edinburgh
Posts: 111

Thanks guys, is the 35mm you are quoting the terminal size or the cable size, is the cable 25mm, 35mm or 40-50mm. Thanks for the picture I can't quite imagine it at the moment and will need to look at the battery when I get home.
Thanks gain. 2.2 2012 110 utility Orkney Grey
Also
Range Rover Evoque - Surprising but I like it.
Previous
Freelander 2 SD4 HSE - Black
90 TD5
Discovery 3
Early Discovery.

18th Feb 2013 11:59pm

christyler

Member Since: 10 Dec 2010
Location: Cork, Ireland
Posts: 67

battery cable

the general rule of thumb with winches/ battery cables etc is the thicker the better, thicker cable gives less voltage drop over a given length when drawing heavy current through it.

i use 50mm2 cable for all things battery/winch related.

19th Feb 2013 12:10am

jayaway44

Member Since: 04 Nov 2011
Location: Edinburgh
Posts: 111

If going to a 12 way fuse board do you need to fuse it down on the way? 2.2 2012 110 utility Orkney Grey
Also
Range Rover Evoque - Surprising but I like it.
Previous
Freelander 2 SD4 HSE - Black
90 TD5
Discovery 3
Early Discovery.

19th Feb 2013 7:06am

Go Beyond

Member Since: 30 Jan 2012
Location: Headcorn, Kent
Posts: 6678

The battery earth cable size is 35mm - buy a terminal for a 35mm cable

You don't fuse earth cables only live

There is a mega fuse already fitted in the live / positive cable

Hope that helps

19th Feb 2013 7:28am

MartinK

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

2011 Defender 110 Puma 2.4 USW Orkney Grey

I have a similar query...I'll post it in case it helps...or maybe someone will tell me the error in my plan

Following the negative line from the battery, it leaves the seat box at the trasmission tunnel, then splits under the chassis member. One part goes onto a M8 bolt on the chassis, and the other (thicker) end goes onto the back of the gearbox (from memory).

Rather than make a change in the battery box (warranty concerns), I was going to crimp (and insulate) a 8.4mm Ring Terminal onto the chassis earthing point, and run a 27 amp cable back into the seat box...

On the positive side there's a spare point on the battery lead connector anyway (it's just the earth/neutral that doesn't have a spare easily-accessible connection).

Would my plan be OK? Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's)

19th Feb 2013 8:25am

Go Beyond

Member Since: 30 Jan 2012
Location: Headcorn, Kent
Posts: 6678

Yes, no problem

19th Feb 2013 8:28am

MartinK

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

Go Beyond wrote:
Yes, no problem

Great thanks for the help

Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's)

19th Feb 2013 9:01am

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