I had to replace the solenoid for my riding mower... there is a green wire that I don't recall where it goes! HELP!

If this is for the starter. Then one cable goes to the battery and the other cable goes to the starter. The wire goes to the soleniod to activate it. Any other wires that are there if they have a large loop would be for ground.

This is a basic straightforward system. Yours may be different because we have no clue what your working on.