Power everywhere, but no spark

Went outside to start the Dart today and all it did was turn over, no spark. So I pulled the #1 plug to confirm my suspicions. The only spark I get is when I first turn the key. I get one spark and thats it. Then when I release the key I sometimes get another spark. I`m stumped. Could it be the switch in the column? I was thinking if it is I am going to switch to a toggle switch for the ignition and a push button to start the car. Does anyone have a wiring diagram on how to do this?