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carpetsauce



Member Since: 19 Mar 2021
Location: Essex
Posts: 58

United Kingdom 
Charge battery through 13 pin trailer socket
Can someone advise what pins to connect to charge the battery via a 13 pin trailer plug please?

I've not been using my Defender so much recently and the alarm sounded when I started it today. I've read that this indicates a lower voltage in the battery. I want to plug a charger to the battery via my 13 pin trailer socket - saves lifting the passenger seat. I'll connect a trailer plug to the battery charger and then to a 220v supply. For the connections I'm happy that the ground is white number 3, but I'm not sure whether to take the power from orange number 9 or grey number10 in the attached diagrams. I'd be grateful for some informed help.






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Post #931448 27th Nov 2021 5:13pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3140

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
I used to have the same problem with the alarm, from lack of use. But I have a 7 pin, so no permanent positive available.

Since I have working lights, and an additional fuse box with spare connections in the battery compartment, I rigged a wire with a 2 pin female connector, fused at 10A as the battery charger I use max is 8A. The battery charger crocodile clips were cut off, and male 2 pin connector attached. This way, I can easy charge the battery (have a smart charger, so technically I can leave it connected 247) without the need of pulling the seat base off.

The crocodile clips that were chopped off also got a 2 pin female connector, so I can use the charger on any other car.

To answer your question, I think you should use pin 9 for +12V. You can also check with a meter (or if you do not have a meter, just a 12V bulb with 2 wires attached) to ensure you have 12V between pin 3 and 9. With the bulb trick, you lack confirmation of the polarity though. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #931453 27th Nov 2021 5:39pm
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LR90XS2011



Member Since: 05 Apr 2011
Location: bickenhill
Posts: 3602

United Kingdom 2011 Defender 90 Puma 2.4 XS CSW Galway Green
Martin does one in his shop, see shop above DEFENDER 90 TDCI XS,

I hope everyone is well and your land rovers make you happy
Post #931454 27th Nov 2021 5:41pm
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nosnibod



Member Since: 15 Aug 2007
Location: West Midlands
Posts: 365

United Kingdom 2015 Defender 110 Puma 2.2 XS CSW Corris Grey
I use Martins one too, with a Ctek charger, and it works perfectly to keep the battery topped up. during lockdown, I managed to completely discharge the battery - to the point where the central locking wouldn’t work. Plugging in the Ctek via Martins 13 pin plug revived the battery perfectly. Dave
Gracie - 2015 110 XS County Station Wagon
Post #931455 27th Nov 2021 5:47pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
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Due to the global connector and electronics (semiconductor) supply issues we have exhausted our stock of parts.

Therefore we are unable to take any new orders at this time, all existing orders have been shipped but uncertain lead times on components mean it is unfair to new customers to take orders without a firm delivery date.

Please email us with enquiries info@fnltd.co.uk

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Post #931456 27th Nov 2021 5:48pm
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carpetsauce



Member Since: 19 Mar 2021
Location: Essex
Posts: 58

United Kingdom 
Thanks all for your input. Quick and informative.
Post #931540 28th Nov 2021 11:21am
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90 Dreamer



Member Since: 13 Jul 2019
Location: Oop North
Posts: 2045

United Kingdom 2016 Defender 90 Puma 2.2 HT Corris Grey
And if you already have a suitable plug but not the wring what is the correct answer to the original posters question??
Post #931609 28th Nov 2021 8:35pm
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nosnibod



Member Since: 15 Aug 2007
Location: West Midlands
Posts: 365

United Kingdom 2015 Defender 110 Puma 2.2 XS CSW Corris Grey
Pin 9 is direct to battery. Easy way to check is with a volt meter of course and makes sure that the wiring is correct and that the 20A fuse hasn’t blown. Dave
Gracie - 2015 110 XS County Station Wagon
Post #931615 28th Nov 2021 9:13pm
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90 Dreamer



Member Since: 13 Jul 2019
Location: Oop North
Posts: 2045

United Kingdom 2016 Defender 90 Puma 2.2 HT Corris Grey
So basically pin 9 for 12V+ and pin 3 for Earth........
Post #931756 29th Nov 2021 8:47pm
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discomog



Member Since: 09 May 2015
Location: Notts/Lincs Border
Posts: 2494

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Santorini Black
I connect my charger through pin 9 (12v+) and pin 13 (earth) Defender 90XS SW
Mini Countryman Cooper S
Morgan Plus 8
Post #931767 29th Nov 2021 9:24pm
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Supacat



Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

United Kingdom 2013 Defender 110 Puma 2.2 XS DCPU Keswick Green
I've recently started to question charging via the towing socket rather than direct connections to the battery.

I've seen signs of increased galvanic corrosion in the usual places and wonder if having the vehicle charger wired this way is actually a factor?

My vehicle is left permanently plugged into a CTEK charger when parked up; and you can see the corrosion oozing from the unpainted rivets behind the rear door. Clean them up and the deposits appear again over a period of time.


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Last edited by Supacat on 3rd Dec 2021 6:53am. Edited 1 time in total
Post #931831 30th Nov 2021 9:52am
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Rashers



Member Since: 21 Jun 2015
Location: Norfolk
Posts: 3328

United Kingdom 2014 Defender 110 Puma 2.2 USW Corris Grey
I have heard of similar issues on Narrowboats plugged into shore lines, Supacat.
Post #931845 30th Nov 2021 10:35am
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discomog



Member Since: 09 May 2015
Location: Notts/Lincs Border
Posts: 2494

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Santorini Black
Indeed, galvanic corrosion is a problem on boats connected to onshore power and some owners fit galvanic isolators which reduce rather than eliminate corrosion. I understand you can totally eliminate it but then that type of isolator is very expensive.

Back to Defenders, like Supacat I keep mine connected to a Ctek when parked and haven't noticed any corrosion like that shown in the photo. I will however be having a close look at it Exclamation Defender 90XS SW
Mini Countryman Cooper S
Morgan Plus 8
Post #931854 30th Nov 2021 11:22am
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Supacat



Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

United Kingdom 2013 Defender 110 Puma 2.2 XS DCPU Keswick Green
Discomog ~ how is your CTEK connected?
Post #931855 30th Nov 2021 11:25am
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discomog



Member Since: 09 May 2015
Location: Notts/Lincs Border
Posts: 2494

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Santorini Black
Through the 13 pin socket via pin 9 and pin 13 Defender 90XS SW
Mini Countryman Cooper S
Morgan Plus 8
Post #931856 30th Nov 2021 11:26am
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