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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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