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http://olive-drab.com/od_mseries_circuits.php
Not all the numbers are on that chart-they haven't updated it in about 5 years. There's some M939 stuff that I've had to Google to identify
http://steelsoldiers.com/index.php?name=PNphpBB2&file=viewtopic&t=4093
Actual schematic: (one is an autocad file and one is a PDF)
http://steelsoldiers.com/index.php?name=PNphpBB2&file=download&id=1572
http://steelsoldiers.com/index.php?name=PNphpBB2&file=download&id=1573