The chances are pretty good that the fallen wire is causing the Crazy Cart to not run. If there is an intact connector on the end of the fallen wire then it should be able to be pushed back into the back side of the switch and no parts will be needed. However if there is a chunk of broken switch on the end of the wire then the switch will need to be replaced or bypassed. If you need a new safety button switch then I will have to check with Razor to see if they still carry it. If they don't carry it then it looks like a fairly common switch to me and I can most likely find another place to source them from.