Roverrog32
Member Since: 04 Jan 2017
Location: Sunny Cornwall
Posts: 30
  
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| No Ignition live to pin 2(blue) 12S socket |
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Evening all,
I have done a bit of searching on here, and although there is lots of useful information regarding towing electrics, I cant seem to find the answer to my predicament 
Hopefully someone can help me as Ive been puzzling myself about it most of the afternoon trying to figure out the best solution.
I've got an old caravan and we are going away next weekend, I was just checking over the electrics with my multi-meter just to check everything was doing what it was supposed to when the car was running.
Main thing is the fridge is working via pin 6 (red) so that's ideal,
Next I notice when I switch the panel in the caravan over to car battery the volt meter shoots up to ~14v as expected, but this is happening via pin 4 (green) which is permanent live from the car battery.
I don't really know why this is, as it is my understanding that the van shouldn't be live from the car all the time, only really when the car is running so as not to drain the car battery.
That aside, the auxiliary battery is not charging when the car is running. the van is wired for pin 2 (blue) aux battery charging, which all seems right, but i dont seem to be getting live from pin 2 when the car is started...?
Is there a fault with the car or is there some sort of sensing/charging relay in the D3 that is stopping this pin becoming live?
I did think as an alternative to put a relay from pin 4 (green) inside the van to charge the aux battery (thus bypassing the blue charging wire (pin 2) that is currently set up)
I cant find any blown fuses in the Disco relating to the electrics, fuse 8 and another, cant remember now! 10A and 30A I think are both ok.
Are there any wiring gurus that can help me with my long winded question?! 
TIA
Rog
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 4th Jun 2017 9:03 pm |
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Roverrog32
Member Since: 04 Jan 2017
Location: Sunny Cornwall
Posts: 30
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Hi, and thanks for.your reply,
I don't mind changing the electrics in the van to suit, I just found it strange that there was no live to pin 2. I'm assuming this pin is obsolete so to speak for the new style wiring that relys on pin 4 for charging leisure batteries.
As my van is older it doesn't have a habitation relay so I need to install a split charge relay from pin 4 to charge the aux battery? So I don't run the car battery flat?
Rog
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| 5th Jun 2017 7:22 am |
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Jamiehol
Member Since: 13 Nov 2015
Location: Ipswich
Posts: 394
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Pin 2 did become obsolete when they changed the wiring in the vans in 1998.
As you say you could modify the van wiring and effectively add a habitation relay so that it is triggered by the fridge feed so that the van battery gets charged when the car engine is running. If you do change the van wiring you should also add the separate earth on the 12s plug that was also introduced at the same time.
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| 5th Jun 2017 6:14 pm |
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Roverrog32
Member Since: 04 Jan 2017
Location: Sunny Cornwall
Posts: 30
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Brilliant, thanks for your reply, that's the route I'm going to take I think 
Rog
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| 6th Jun 2017 9:22 am |
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Skynet
Member Since: 23 Jul 2014
Location: Melksham, Wiltshire
Posts: 868
 
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I followed this issue too, unaware of the pin 2 change. I found the switched live relay behind the tow fuse block was missing. I've added a switch in the line to use it again. Dave
D3 2006 HSE, Cairns Blue - gone
D4 2016 SE, White
Wessex 4x4 Response
http://www.wessex4x4response.org.uk/
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| 6th Jun 2017 9:34 am |
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Jamiehol
Member Since: 13 Nov 2015
Location: Ipswich
Posts: 394
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Roverrog32 wrote:Brilliant, thanks for your reply, that's the route I'm going to take I think
Rog
No problem, post back here if you get stuck. Might be worth seeing if you can find a post 1998 wiring diagram for which ever van you have as that may help with you modification.
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| 6th Jun 2017 5:57 pm |
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