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Strictly speaking it is likely the internal regulator.Ā Ā WHen they start to fail the voltage control often goes out the window with the resulting voltage climbing way beyond what your equipment AND you batteries will tolerate.
I would suggest first though using a DMM clipped to the main alternator output post and a good ground, alternator.Ā Run the engine at a very fast idle to get it to produce and watch the voltage produced.
If it still shows the same then the regulator is failing.Ā Ā Do not ignore it as it likely will get worse and ruin other equipment.
Assuming it does the same then remove the alternator and either get it repaired at a starter/alternator repair shop of get a rebuilt unit.
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