BOTH generators and alternators have a slight residual magnetism in the soft iron poleshoes or rotor segments.
I don't think "a generator has a permanant magnet field" is a true statement in the conventional sense of the term "permanent magnet", as a generator that sits unused for a long time often has to be polarized to restore it's "residual magnetism" so it will charge.
Any alternator will produce a small AC voltage from it's stator windings at startup due to residual magnetism in the rotor, it's often NOT enough to get past the forward voltage drop of the diode trio and electronics in the regulator to get turned to DC and feed to the slip rings and rotor.
Kits to change a standard alternator into a "one wire alternator" are often sold as "having special low forward voltage drop diodes" in the diode trio and a special regulator to create enough DC from that little bit of AC to send the rotor to generate more magnetism and MORE voltage output, bringing the alternator "on-line".
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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