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12s socket pin 6 ignition on feed not working
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Ashes
 


Member Since: 09 Jun 2009
Location: Melbourne
Posts: 13

Australia 2014 Discovery 4 3.0 SDV6 SE Auto Chawton WhiteDiscovery 4
12s socket pin 6 ignition on feed not working

I’m trying to use pin 6 on my 12s socket as a ignition on sense feed to turn my DCDC charger on in my caravan.
I have a separate Anderson plug for the actual 12v feed so not running that via the trailer sockets but I need an ignition sense wire to activate the changer only when the car is running. I have a lithium battery setup in the van which would quickly deplete my car batteries if it was left to draw power without being switched off.
Putting a multimeter across pin 6 on the 12s socket and the central pin I dont get a reading when the engine is on. I get 12v+ on pin 4 as expected.
I have a 2014 D4 (Australia).
I’ve checked all the fuses I can think of which are 48, 54 and 55 and they are all good. I think 54 is the fuse it runs off.

Anything else that might not be allowing that circuit to switch on with the ignition? Any thoughts on what to check next?

Am I missing something with the way the number 6 pin works for it to be supplied voltage?. I would have thought…ignition on..12v on.  
Post #223172122nd May 2021 8:11 am
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D4mation
 


Member Since: 29 Jul 2011
Location: Ruralshire
Posts: 593

United Kingdom 2012 Discovery 4 3.0 SDV6 HSE Auto Ipanema SandDiscovery 4

Do you get 12v from pin 6 when the engine is actually running, rather than just ignition on. MY12 D4 HSE Ipanema Sand  
Post #223175022nd May 2021 1:58 pm
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Ashes
 


Member Since: 09 Jun 2009
Location: Melbourne
Posts: 13

Australia 2014 Discovery 4 3.0 SDV6 SE Auto Chawton WhiteDiscovery 4

Nothing when the engine is running.
I do get 12v from the permanent pin but nothing on the ignition one. I’m going to check fuse 54 again to see if there is power each side of it and i think there is a relay after that which I’ll find and check as well.  
Post #223175122nd May 2021 2:15 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10407

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

On the D3, in the passenger rear are 2 mini relays.

1 is the wiper (5 pin) the other the ignition supply for trailer. (4 pin)
See if relay clicks when ignition turned on and check for power there  
Post #223175822nd May 2021 5:15 pm
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Ashes
 


Member Since: 09 Jun 2009
Location: Melbourne
Posts: 13

Australia 2014 Discovery 4 3.0 SDV6 SE Auto Chawton WhiteDiscovery 4

Sorry, realised my profile was showing my old D3. This is on a D4 so no fuses in the rear cubby hole.
Got a few things to check now I’ve seen a wiring diagram.
Check if fuse 54 has power.
Find the trailer relay (not sure where that is) and check it is working.
Check the wiring harness for the 12s socket to see if the red wire is connected and is getting power. Check the 12s socket to see the pin is connected properly.  
Post #223184623rd May 2021 1:03 am
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eightfoot
 


Member Since: 12 Apr 2015
Location: sunny essex
Posts: 770

United Kingdom 2005 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

im "quite" sure there are fuses in the rear cubby for the tow electrics on my 2013 d4 so still worth a check please excuse any grammer/punctuation mistakes,i'm thick,thankyou
current vehicles 2005 d3 2013 d4  
Post #223187823rd May 2021 9:48 am
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Ashes
 


Member Since: 09 Jun 2009
Location: Melbourne
Posts: 13

Australia 2014 Discovery 4 3.0 SDV6 SE Auto Chawton WhiteDiscovery 4

Cant see any fuses back there but making some progress.
Fuse 54 definitely has power so that fuse is ok. Found the connector in the rear cubby and it only has 2 wires into it on my D4. One is a always on 12v which is working. The other wire has no power when the ignition is on or off. This connects to Pin 6 on the 12s socket (I tested by putting 12v though it and also a resistance test on that wire). The problem appears to be between the fuse and socket. There is a “trailer” relay somewhere in the D4 but not sure where that is. If that relay is not working that would explain the fault. Less likely the wiring would be damaged.
Any idea where the relay for that circuit would be located?  
Post #223188423rd May 2021 10:15 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10407

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Pete K wrote:
On the D3, in the passenger rear are 2 mini relays.

1 is the wiper (5 pin) the other the ignition supply for trailer. (4 pin)
See if relay clicks when ignition turned on and check for power there


Maybe the relay is the same place as the D3 Rolling Eyes

It’s in a separate loom to the fuses, so could be there regardless of whether you have fuses.  
Post #223188623rd May 2021 10:26 am
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