The alternator does not shut off during glow plug cycling. Ford diesel alternators did not even have PCM or any other outside influence that affected charging until the later 6.0's and that was only if the truck had the dual alternator option, then the 6.4 had a PCM controlled alternator, which still didn't shut off for that reason.
Glow plugs can draw a peak current of close to 200 amps, the amperage drops as they heat up. The starter motor can draw over 300 amps. Count the draw on the glow plugs and the batteries recovering from starter draw, plus all the other things pulling load on the batts after running ( HVAC, lights, fuel heater, intake air heater etc. ) 200 or even 100 amps is going to make the gauge drop a bit, especially at idle. A 100 or 200 amp alternator is not going to charge it's peak amperage at idle speed either.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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