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Definitely your alternator. You say that when you first start it the battery voltage is about 14 Volts, and the alternator is properly sourcing current. After a while, the alternator only puts out a few amps, and battery voltage drops. The glow plugs staying on wouldn't cause that; while battery voltage might go down the alternator draw would actually increase. "No diode ripple" is further indication that the alternator is failing to supply power. The diode ripple is the result of the rectification of the phases generated within the alternator.
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2004 (2003 motor) F-350 CC LB King Ranch DRW.
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