ignition

Hi
someone missed up when my ignition lock and i cannot get my key in it. So what i did is I pulled out the three wires.
SO when i join the two red wires the bike comes alive. and I was wondering what the third wire is, which is blueish green in color,
should I join all the three wires with a tape or just the two , The bike works fine with only two.

Some bikes have a key position that leaves the running lights on in case you're stranded on the side of the road. Couldn't say for sure unless I had the schematic.