hey everyone this may seem like a dumb question but I am in need of a bit of help figuring out what wire is for what on the back of my ignition switch in my 5.0L ef fairmont , but all i could find out from google was this:

Black= ground (obviously)
Yellow - Constant from battery
yellow/red - ignition
yellow/blue - acc
red/black - start

So my question is what is the left over green wire for?

power distribution sheet shows
yellow - pwr
black/yellow - acc
red/dark green - ign
red/dark blue - start/charge

on another page it shows a black & another wire for brake fail