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disconnect your batteries and clean all the grounds, and connections to the alternator/starter etc. The 6.0Ls have a severely underrated charging system. Long story short 4 batteries, an alternator, and a FICM before I really understood the issue lol.
I would get each battery tested when not connected to the truck, take your alternator off (takes 5 minutes as you probably know) test it off the truck. Check the battery and wire connections.
Not likely you have a bad alternator but on the 4th one something else is going on.
-99 F250, 4X4, 6.0 trans cooler, 08 mirrors, 05 grill, AIS Intake, lvl kit, JW Vbody, cncfab hpop lines, WW2.
04 Excursion Modified, 04 F350 Modified, 06 F350 Modified
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"Its like me getting five 5 gallon bucks and throwing regular, mid, premium, #2 diesel and offroad diesel and then shooting a roman candle at each one to show which ones burns better."