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Help with split charge system
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Moo
D3 Decade 


Member Since: 13 Aug 2010
Location: UK
Posts: 14385

Ukraine 2005 Discovery 3 TDV6 S Manual Zambezi SilverDiscovery 3
Help with split charge system

I have a second hand split charge from a D3 that I need to fit to my D4. I'm confused with where port 86 connects to.




 New Defender L663 110 SE (known as Noddy!)

Sold Volvo XC90 R-Design (known as Basil)

Sold - D4 HSE (Known as Gerty)

No longer the Old Buses original owner Sad
231,000 miles and counting
05 S manual owned from March 2005
D4 Face lifted
Still original injectors and turbo
V8 Front brakes
BAS Remap, Allisport Intercooler and deCat
EGRs blanked
T-Max split charge
Hanibal Expeedition rack
Prospeed ladder
Duratrac tyres
IID BT
BAS FBH control 
 
Post #20730302nd Aug 2019 1:42 pm
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enb54
 


Member Since: 11 May 2019
Location: Red Deer, Alberta
Posts: 105

Canada 2007 LR3 4.0 V6 Petrol SE Auto Stornoway GreyLR3

If your relay ground is on 85 then battery to operate the relay must be on 86, thus closing the contacts to enable your auxiliary battery to charge. Usually this is switched battery, only on when the engine is running, releasing when engine is off. Just google auxiliary battery charging and I'm sure you'll get enough information for a safe, reliable installation. If you don't understand what you are reading, have a friend who has some electronics/DC electricity experience/training to assist you, it should not be very difficult.
 1967 Ford Bronco 289 V8 (1968)
1974 Toyota FJ55 3.9L I6 (1975)
1984 Chev K5 Blazer Camper 400 V8 (1989)
2006 Nissan X-Trail Bonaventure 2.5L I4 (2007)
2007 Land Rover LR3 4.0L V6 (2019) 
 
Post #20730362nd Aug 2019 2:05 pm
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Moo
D3 Decade 


Member Since: 13 Aug 2010
Location: UK
Posts: 14385

Ukraine 2005 Discovery 3 TDV6 S Manual Zambezi SilverDiscovery 3

Thanks. 85 is earth but not sure where to connect 86 to on a D4. Any pics etc appreciated.
 New Defender L663 110 SE (known as Noddy!)

Sold Volvo XC90 R-Design (known as Basil)

Sold - D4 HSE (Known as Gerty)

No longer the Old Buses original owner Sad
231,000 miles and counting
05 S manual owned from March 2005
D4 Face lifted
Still original injectors and turbo
V8 Front brakes
BAS Remap, Allisport Intercooler and deCat
EGRs blanked
T-Max split charge
Hanibal Expeedition rack
Prospeed ladder
Duratrac tyres
IID BT
BAS FBH control 
 
Post #20730392nd Aug 2019 2:23 pm
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James W
 


Member Since: 27 Mar 2008
Location: Riyadh, KSA
Posts: 3079

Saudi Arabia 

I would have thought any ignition-switched live would do. I'll try and see where I connected mine to.

Edit: is that a voltage sensing relay? If not, it will connect your batteries with ignition on, regardless of the state on the starter battery
 D4 XS, gone, much loved, never forgotten
2018 FFRR SDV8 Autobiography - Gone to someone with less sense and more time to enjoy it Very Happy
2016 Toyota Hilux Invincible - Liberating experience 
 
Post #20730432nd Aug 2019 2:39 pm
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methley
a.k.a. Big Hairy Ski Monster 


Member Since: 07 Oct 2008
Location: Marshfield, South Glos
Posts: 2433

England 2006 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3

It's a voltage sensing relay. It doesn't connect to anything Thumbs Up
 Andy

Fridge Slide for sale https://www.disco3.co.uk/forum/post2064622.html#2064622 
 
Post #20730442nd Aug 2019 2:45 pm
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Moo
D3 Decade 


Member Since: 13 Aug 2010
Location: UK
Posts: 14385

Ukraine 2005 Discovery 3 TDV6 S Manual Zambezi SilverDiscovery 3

Embarassed Thanks. I'll just eat it then.
 New Defender L663 110 SE (known as Noddy!)

Sold Volvo XC90 R-Design (known as Basil)

Sold - D4 HSE (Known as Gerty)

No longer the Old Buses original owner Sad
231,000 miles and counting
05 S manual owned from March 2005
D4 Face lifted
Still original injectors and turbo
V8 Front brakes
BAS Remap, Allisport Intercooler and deCat
EGRs blanked
T-Max split charge
Hanibal Expeedition rack
Prospeed ladder
Duratrac tyres
IID BT
BAS FBH control 
 
Post #20730452nd Aug 2019 2:46 pm
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Martin
Site Admin and Owner 


Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18561

United Kingdom 2006 Discovery 3 TDV6 SE Manual Buckingham BlueDiscovery 3

That is not a voltage sensing relay, it's just a standard relay, 100A rated.

You are missing either an "engine running" trigger signal, or a voltage sensing relay to create that trigger for this big relay.
 06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know! 
 
Post #20730462nd Aug 2019 2:49 pm
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methley
a.k.a. Big Hairy Ski Monster 


Member Since: 07 Oct 2008
Location: Marshfield, South Glos
Posts: 2433

England 2006 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3

From memory it also has a time delay - it won't switch until so many seconds have elapsed - so be patient when testing.
 Andy

Fridge Slide for sale https://www.disco3.co.uk/forum/post2064622.html#2064622 
 
Post #20730472nd Aug 2019 2:50 pm
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methley
a.k.a. Big Hairy Ski Monster 


Member Since: 07 Oct 2008
Location: Marshfield, South Glos
Posts: 2433

England 2006 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3

Martin wrote:
That is not a voltage sensing relay, it's just a standard relay, 100A rated.

You are missing either an "engine running" trigger signal, or a voltage sensing relay to create that trigger for this big relay.


Martin, I assure you it is. The case is standard, the innards not so. It was on my car for many years!
 Andy

Fridge Slide for sale https://www.disco3.co.uk/forum/post2064622.html#2064622 
 
Post #20730482nd Aug 2019 2:51 pm
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Martin
Site Admin and Owner 


Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18561

United Kingdom 2006 Discovery 3 TDV6 SE Manual Buckingham BlueDiscovery 3

So it's been modified internally?
 06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know! 
 
Post #20730492nd Aug 2019 2:52 pm
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methley
a.k.a. Big Hairy Ski Monster 


Member Since: 07 Oct 2008
Location: Marshfield, South Glos
Posts: 2433

England 2006 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3

Yes, there's a PCB with micro controller inside, all potted up.
 Andy

Fridge Slide for sale https://www.disco3.co.uk/forum/post2064622.html#2064622 
 
Post #20730502nd Aug 2019 2:53 pm
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Martin
Site Admin and Owner 


Member Since: 06 Nov 2004
Location: Hook Norton
Posts: 18561

United Kingdom 2006 Discovery 3 TDV6 SE Manual Buckingham BlueDiscovery 3

A label on the outside to that effect wouldn't be a bad idea Whistle

To be fair, "help" with a photo of a relay case doesn't show that.
 06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know! 
 
Post #20730512nd Aug 2019 2:54 pm
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James W
 


Member Since: 27 Mar 2008
Location: Riyadh, KSA
Posts: 3079

Saudi Arabia 

Okay I checked mine and reminded myself that mine is different as the solenoid is switched to earth instead by the T Max controller (which acts as the VSR in this case), rather than taking an ignition switched live to activate it.

Have you got another bit to your 2nd hand kit somewhere?

EDIT : I'll bow out, this is getting confusing Rolling with laughter
 D4 XS, gone, much loved, never forgotten
2018 FFRR SDV8 Autobiography - Gone to someone with less sense and more time to enjoy it Very Happy
2016 Toyota Hilux Invincible - Liberating experience 
 
Post #20730562nd Aug 2019 2:58 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 14129

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Is this any use ?????

https://www.autospark.eu/shop/relays-flash...pins-100a/


Click image to enlarge
   
Post #20730572nd Aug 2019 3:00 pm
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methley
a.k.a. Big Hairy Ski Monster 


Member Since: 07 Oct 2008
Location: Marshfield, South Glos
Posts: 2433

England 2006 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3

Here you go, for those interested.

https://web.archive.org/web/20120908232413...relay.html

Click image to enlarge


Click image to enlarge
 Andy

Fridge Slide for sale https://www.disco3.co.uk/forum/post2064622.html#2064622 
 
Post #20730602nd Aug 2019 3:06 pm
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