hi all, need help!

There are 4 wires on the ignition cap, red, black, yellow and .. brown i think. not to sure about the brown. I need to know what they all do as i have a new cap and key, need to wire them up but have no idea what to put where. on the new cap there is

ACC

BAT

ST

and 1 other 1.

am far away from car so cant remember it all from the top of my head! lol

hellp!