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Google "load dump" and learn. This is from one of my old General Glectric Metal Oxide Varistor manuals, it's dated 1976, so there is nothing new about it. The regulator often fails due these transients, so never remove the connections to the batteries when the engine is running. I don't think...

An alternator/generator will produce large voltage spikes if the connection to the battery is interrupted (=bad connections). It is know as a "load dump" when this occurs and the voltage can easily be in excess of 100 volts.

Voltage readings appear close to normal... Check and clean your battery connections and as long as the batteries are fully charged 2-3 years is far from an aging battery. Now, if they have been sitting at less than full charge, replace them.