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
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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