Can't start, no spark getting to plugs

Lonewolf3165 said

Reading your post 1 more time made me think/wonder if its a bad ignition switch or the circuit from the switch. It may be getting good voltage in the starting position but losing it when the key is released to the run position.

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I just fixed this problem on my 70 Dart I just bought. The engine would kick and start when cranking, then immediately die when key was released to ON position. Turned out the ignition box was wired for 12v in start position, but no voltage in ON. Jumped it to another pin I tested for 12v in both positions, and it fired right up.