Previous owner installed toggle switch

Recently purchased 72 swinger. Previous owner installed a blue toggle switch inside the engine bay that connects to the bottom right post of the ignition cylinoid and then a ground on the fender. First thought was that it was something to do with remote start inside the engine bay. So we removed it and then the car would not start. So we put it back on and the car starts as long as it's in the right position. I'm guess now it was put on for an extra theft deterrent. What am I missing that needs to go back on for me to remove this?