Automotive alternators tend to put out as much as 14.4 volts and that is supposedly ok for chassis components. I would think that bulb life would be shortened at that high a voltage, but probably not much other effect.
You should have an isolator between the alternator and the house batteries and they typically drop the voltage a bit. Check the voltage at your house batteries with the engine running and shore power disconnected. Hopefully it is under 14.0v and closer to 13.7v
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL