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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Today's Featured Article - Fordson Model N: Field Service Operations and Lubrication - by Anthony West. The daily or weekly servicing of any vehicle is of the utmost importance, and in days gone by when our favorite tractors were doing an important and Commercially vital job on the farm, these service operations would make a major difference to the running costs and economy of the farm. This being so, it surprises me to see how many enthusiasts attending rallies, shows etc, seem to be unaware of the importance of this constant attention. Possibly the modern machine with its 6,000 mile or even once
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