Originally Posted by carsounds_dan

basically you need a fuse holder, a relay and an ignition wire.
put a wire to the battery + to the fuse holder, then from that to pin 30 or a 4 or 5 pin relay.
put pin 85 to ground (or the battery negative). find a wire that goes live when the ignition is turned on [i think that it's the orange one... i'll check next time i've got it in bits] put this to pin 86.
put the feed to the power socket to pin 87 and bob's your uncle.. you may need an earth with the power socket.. if you do earth it to the battery with the relay's earth.
don't go running sockets off of original wiring, the wires are designed to run their original purpose, not to have extras put on... they will burn out and blow fuses etc.
if you want any more advice let me know.
cheers
dan