13 pin wiring

blaxkmax

My car has 13 pin socket & caravan has 12n & 12s. Rather than the agricultural adapter. I have chopped of the plugs on caravan & connected to the 12 core cable via choci block.
However, in the 13 pin/12 core cable, there,s nowhere to connect the blue charging wire thats in the 12s . Theres no mention on 13 pin socket of this function.
So what i want to know is what ya do with the 12s blue wire.

Vulcan

The charging wire 2 is not connected, charging is supplied through pin 9 which energises the on board change over relay, assuming your van is approx post year 2000.

jennyc

This link describes both socket connections.

https://www.witter-towbars.co.uk/knowledge-hub/towbar-electrics-the-definitive-guide#:~:text=If%20your%20car%20has%20a%2013%20pin%20electrics,to%20tow%20an%20older%20caravan%20with%20twin%20electrics.

On the face of it, your blue wire is for rear fog lights. So it goes to the 13 pin  no 2. If in doubt, check the function of the 7 pin socket that the blue was connected to.