Some have regulators and some do not. The rectifiers are usually (but not always) in four-unit brides. A varistor is often used to protect the rectifiers from voltage spikes.
The field "bridge" set of probably four rectifiers gets AC on the input and makes DC on the output that is sent to the field to "excite" it. If any of the rectifiers fail, you get no DC field current and the unit will not work.
How many brushes or "slip rings" does your unit have?
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