Get an oscilloscope and record the waveform/output. Take that to them and see what they say. Then tell them to prove otherwise. It may be sticking (or worn) excitation brushes, or a floating rotor, or the avr is just nbg, or a poor contact in the voltage sensing side. May be other obscure causes like a dodgy drive belt.
14.7 volts is too much. It should be 14.4V. Your meter may need calibrating to prove that (but it might easily be 14.9V which is far too much voltage for any 12 volt lead acid battery at full charge). Digital meters often read too high when it's internal battery is getting low.
Check your battery electrolyte level if the charging voltage exceeds 14.4V as it will be electrolysing the water.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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