Need to find switched 12v wire that's hot while cranking & with key in ON position

i know on my scamp i used a brown wire coming out of the column for my msd box what year and what car do you have i may have a wiring diagram for it

I've got a good wiring diagram already for my Dart.
But, your answer about the brown wire just made me go DOH!.
I will hunt for that wire tonight.
Thanks.