We have recently purchased a 2016 vw golf which is still under warranty - our caravan is a 1999 abbey iona vogue with 12n/12s electric sockets - I only require the caravan lights to function - I'm not too fussed about charging the leisure battery or powering the fridge on the go so basically the 12s socket is superfluous - my local garage suggesed fitting a universal 7 pin single electrics plus a 7 way bypass relay - my enquiry is - is this acceptable and would such a fitment invalidate the car manufacturers warranty - the genuine vw golf mk7 tow bar electrics 13 pin fitting kit is £159.95 from eBay and I don't think I require that - or am I mistaken