Hope someone can help! We have 4x original and 2x third party Lightning cables that all charge our iPhones fine from USB ports on our laptops or direct from the mains (240v in the UK). When we try to use any of these cables in our van, none of them will charge any of our devices! We are using USB ports that plug into the cigarette socket running from the van battery, and USB ports wired into a leisure battery. All USB ports in the van seem to work with other items and these cables used to charge our phones fine in the van but stopped working. We have tried everything we can think of, any ideas?