Wiring question

Hello,

I just purchased a 1973 wr250. The wires comming out of the ignition have been cut. There are three wires Black, green, and yellow. I am trying to figure out where each of these go. Also what wire do I connect to the kill button?

Thanks

Sean

Black goes top ignition and the kill switch goes to the black wire as well, yellow goes to lights, and the green goes to the stop light.

Thanks for the info