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Yes, the Niehoff uses an external voltage regulator. Check out this thread:
http://www.steelsoldiers.com/showthread.php?158150-where-is-the-wired-568-connected-to-on-200amp-generator
It would be good to locate the wiring diagram in the TM as it shows the alternator connections; it is in TM 9-2320-280-20-3 on page 1159 of the pdf. You should find the alternator wires in the vicinity of the left valve cover. They were previously used on the voltage regulator of the Niehoff...