I can think of two other possible issues.
FIRST: Measure voltage AT THE ALTERNATOR battery terminal (That's the big one) First put the ground on the alternator case/housing, then on the engine, then on the battery negative.
This has been known to be diagnostic, though I do not think you will have the same problem, If you have NO voltage on any of those paths, You have found the problem (most likely a fused fusable link).
I had a different problem.
The other problem (loose fan belts) not likely with modern serpentine belt engines.