AM switch with original fog light harness

I have a '13 base with a wiring harness for fog lights. I put in the lights and a relay but I want to add an after market rocker switch that matches the others. The problem is that there are three prongs on the switch but four wires coming out of the harness. Has anyone added an AM switch to their stock wiring harness? I want to know what wires to hook up where or at least a link to know what each wire does.

Thanks a lot, when its all done I plan on positing pictures.

FYI for those who want to add fog lights, I used an after market set meant for a '07 camry and it fits like a glove.

 

I believe I was able to answer my own question. There are four wires: green, green/white, blue, black/white. From what I found is:
Green= switch illumination
Green/white= ground for switch illumination
Blue= power out to the lights
black/white= ground

Can anyone confirm this or know anything different?