Let's go at it a bit at a time, leshby.
1. What are the symptoms of the problem? From what you've said, I think your engine starts properly, but you have problems stopping it. You have to get off the mower, and ground the dark green wire to the engine. Is that right? Can you stop the engine by any combination of not sitting on the mower seat, leaving the handbrake released, engaging the cutter clutch, and turning off the master (key) switch?
2. Where did you connect the dark green wire on the mower? What colour is the wire you connected it to, and where does it go?
This problem is extremely simple, we just need to both get on the same page. At the moment I'm being frustrated by not seeming to get answers to my questions, and you are being frustrated by not being told what is wrong and how to fix it. We need to work together to overcome both sources of frustration.
