Off to deepest Wales next week so thought I would test my mobile charging cable - well, has done nothing but blow my house RCD fuses at the box - thought it was possibly the extension lead so plugged direct to house socket - same result! then tried the granny cable for my wife's i3 - success and normal overnight charge successful. Back today and plugged in to same i3 cable - no charge received and charging fault showing on i3 cable box. Have plugged into our normal wall charger and charging successfully So question is, am I doing something wrong? Do I need to adjust anything in the car? Has anyone else had problems, or do I have a faulty cable? Any comments welcome!