No spark question

I have a 71 Dart with a 318... I have done the amp bypass and it is charging great. The problem is that last night when I tried to start her No GO... I used my trouble light and confirmed that there was no voltage to the coil when cranking. To get home I jumped from the battery to the coil and it fired right up. Am I looking for a feed from the ignition switch for this power? I have a schematic and will be working on her after work, but any hints or experiences would help.... THANKS

P.S. Ballast has been bypassed and I am running a Pertronix 2