I have never heard of the alternator putting out too much voltage. Usually the brushes in the regulators wear out and the voltage drops. You could have a bad regulator in which the internal circuits have gone bad but the brushes are still good. I notice on my Chevy that if the battery is weak it will put out about 16 volts until the battery is charged. Then it will drop back to 14.

Tell you what, put the battery on a charger overnight then check the alternator voltage again. It could be just the battery going south on you.
If the voltage is still too high, I would replace the regulator and then check the voltage again.

Good luck!

__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad