Most Delco alternators have a minimum cut-in speed of 1200 RPM, but it can vary depending on exactly what regulator is stuck int there. When mounted on auto or truck engines, the engine speed to alternator speed ratio is usually at least 2.3 to 1, but many are up to 4 to 1. Tractors sometimes a litle slower at 1.9 to 1. At 2.3 to 1, and an engine idling at 600 RPM, the alternator is spinning at 1380 RPM.
It can depend on many things and not all alternators are the same, even when the same model #. There are several different regulators that can be installed and all have different cut-in values. Pulley size also changes things.
Some 12SIs and 17SSIs can self-excite with no field current and no self-excite regulator installed, if run fast enough. All depends on the condition of the residual magnetism.
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