Ignition won't crank engine unless ballast is unkooked

Hey trying to find out if anyone can help me with my 74 360 4speed duster started up fine yesterday on the key now will not turn over on key unless I unhook one side of ballast tried crossing over at starter relay with key ignition on ballast hooked up and then still will not start until I hot wire from coil to battery any ideas what this could be I have replaced my starter/ignition relay and my ecm and has new ballast