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Hi folks, we've got a 2004 X-trail.  We're planning to go away without hook up for the first time and so have just checked the 12s socket on the car.  We opened up the socket and tested the feeds to the wires.  Number 2 wire (12v ignition on - battery charging) is not present and number 5 wire (reversing sensors - usually spare) is not present either. 

I was just wondering could we change the wire from number 6, (12v ignition on - to fridge) which we don't need (we'll run the fridge on gas once pitched), into number 2 to charge the battery on site if it goes flat?

Thanks in advance for any help!  Natalie