I don't understand what you mean when you said there was no field output so the regulator would not turn on. The regulator provides field output - it needs to be turned on to do so. The field is drawn from the 12V line connected to a constant power source (typically the battery), but the regulator is turned on through a switched 12V power source (commonly the ignition).
Is your regulator turning on with LED's showing? If so, it should power and control the alternator. If there truly is no voltage on the field wire when the regulator is operating, then perhaps the regulator is bad.
Is the sense wire connected?
Is there a tach, and does it work/
Does the alternator give full current
when you (briefly) connect the field terminal to 12V?