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The functions are there, but the old way was with relays that switched on and off very rapidly. See TM 9-8000 for description of operation. Images below from 1956 issue.

From an article in MVM issue 101 Feb 2004.

I think Keith is discussing his M37 system, a generator with a separate regulator. No "exciter" wire.

You may have to polarize the generator. Let me check up on the procedure and get back with you. Also, of course make sure the cables are good, ring 'em out with your VOM.

Here is a schematic, just follow the connection on top from GEN on the top right to BAT in the lower left in the picture. Same wire from generator to battery, with a low resistance to monitor current and an SCR switch to turn the circuit on/off as needed by the regulator.

The regulator regulates the generator, so the voltage at the batteries is the actual generator output.

Not sure what you mean with "sealed system", the DC generator is regulated by the externally housed regulator in the M37 (also my M35 25 amp system). You can still monitor the performance on the dash gauge, which shows the same voltage as you would measure at the batteries, which in turn is the...