No Spark, but have power to the coil?

You don't have a two field alternator, you have an alternator with one field and 2 connections to it; one goes to the regulated ground side and the other goes to the positive supply. The earlier alternators also had one field winding of which one side was internally grounded and the other came out to connect to the regulator.

In any case the charging system has nothing to do with the ignition unless of course the voltage is way low.