What is burning up alternators on my 2007 f350 ford 6.0 deisel

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If this is the same problem as before you changed the Alternator, it must be a different area. Flickering sounds like Regulator cut-out. You did not say if flicker was constant or only when Glowplug Timer was cycling. Usually the Regulator is inside the Alternator.

Have you checked both Batteries for shorts?

Then some of these engines have a fuel pump regulator. If you are not maintaining a steady RPM due to fuel shortage, the battery light could illuminate as RPM falls critically.

You may have a bad crankshaft sensor. Less likely as it does not self-correct. About all I can add is that the things I mentioned may not show up on the self-diagnostics.

Yes, I would say it is the head gasket again. Have the head checked for flat surface once removed to replace the gasket.

You most likely have a vacuum leak. Look for a loose vacuum hose that didn't get replaced after last service. Find the source of the hiss and you'll find the leak. Read this post on some tips:
http://ricksfreeautorepairadvice.com/diagnose-squeak-noise-creaks-and-squeals/

Diagnose squeaks creaks and squeals

i have a 1994 f350 diesel 4x4 the engine wont start

must identified what part of it is leaking has it been changed and wrong or wrongly installed gasket promble

check a/c bearing/pulley, remove turn all pulleys see if turn smoothly

sounds like a glow plug circuit problem.

try to clean the valve

You should have a hydraulic brake booster. a common failure item on fords and also would cause your symptom. the burning smell, I would go back and recheck all the brakes. Maybe a problem with the e-brakes, or an issue with the front or rear calipers. Possibly a damaged steel or high pressure brake line. Good luck.