Superjet will not shut off

Location
NJ
So life had gotten busy and my Superjet sat for two years. Just pulled her out and cleaned it up and fired it up. She fired right up and it would not shut off with the stop button or pulling the land yard. The motor was not running away it just wouldn’t shut down. So trued it again and same thing. Then I trued to start it without the landyard in and it wouldn’t try to start without it then put it in and it started and wouldn’t shut off again.

So then I pulled the connector between the electric box and the off and landyard checked it and the switches work.

So where does this leave me? When you make the connection by pulling the landyard or pressing the off it grounds the system out to shut it down correct?
 
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