Hi i have a 2011 KA, and recently plugged in a USB charger socket for phones into the cig socket, and it went pop followed by wisps of smoke. I just thought it was an old charger and had it's last breath. Bought a new charger and today plugged it in and again it went pop followed by wisps of smoke. I tried the lighter in the socket & that still works so it's not blowing the cars fuse (5A standard if i remember rightly) so what's going on any ideas? Could the socket be wired up back to front & still work the lighter as i replaced that recently-there were only 2 wires to socket.