Sarah, who I guess is in the US, has been trying to find a wiring diagram for a Grasshopper, so here you go …
That’s the only one I have, and it may or may not correspond exactly to your particular Grasshopper. Even if it doesn’t, my own feeling is that if some aspect of your machine’s wiring is not obvious to you and you can’t work it out from this diagram, maybe it would be safer for you to have somebody else take a look at it.
Here’s the same thing as a PDF
Elna Grasshopper blog 