Nothing piggy backing on that wire and it is wired on the battery side of the sitch. It wont shut the car off if you push it in. But if you try to start the car with it pushed in it wont start.
66 Dodge Coronet 500
440w/727
11:10 30 over 440 w/292 purple shaft,stock Eddy heads,3:23,full exhaust
Best ET. 12.38 @110 in street trim