Finding a constant and non constant power wire in a car

Question

The car I have is a 2001 Buick century. I have a after market push to start kit. It came with a main unit and the diagram shows that a brown wire is for a constant power when the engine is on. And a white wire that needs a non constant power. the diagram says a non constant power when engine is started it's not hot

Answer 1

The only place where I'd expect such a wire is the one between the ignition lock and the starter relay (i.e. the one that tells the starter to crank).
Do they expect you to splice your starter button into this lead?