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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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