hi mate i would'nt reccomend hijacking a live from any electric compononts, either go straight to the fuse box passenger side under the dash, or ignition column, you'l need an electric tester. turn the ignition on and probe the wires until you find a live, then turn ignition off to see if it dies, personally i'd go for the fuse box, theres usualy spare slots for additional items eg cd player thats where mines wired. but i've done it to ignition in the past as theres only 5 or so wires to play with, or ease of fitment tracing the wiring ,but you have to remove the cowling, plastic around the ignition barrel.