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Doesn't that have 2 alternators? I have a 2005 F350 with the 6.0l and it has 2 alternators.
Hello, do you have a multi meter by chance?
Ok, 1 alternator. Let's assume the alternator is fine. It might be the wire itself, so let's compare the 2 tests, one at the battery positive post and the 2nd at the back of the alternator at the positive B+ post, with all accessories off nd the engine reved up to 2,000 rpm. The voltage at both spots should be between 13.2-15.5 volts.
Let me know the results of these 2 tests.
If, the voltage is more at the alternator than it is at the battery, the thick wire between the battery positive post and the alternator B+ post is bad and most likely corroded on the inside.
Did you complete those 2 tests?