I've bought a Parrot Asteroid Mini and an SOT-976FB ISO lead to interface into a 2009 520d (E60). Being a bif of a techno-pleb I haven't done a very good job of installing it. Can anyone offer any advice? Specifically, I need to connect a wire to a permanent live wire, e.g. ignition, but the leaflet that came with the lead suggests wiring to cigarette lighter, but which wire, there are 3?! Any assistance is greatly appreciated.