Yes, it can. If the regulator supplies full voltage to the field coils the alternator will go into full current output and severely overcharge the battery. A shorted power transistor in the regulator will full-field it. At speeds above idle, the voltage can go to 20+ volts or more.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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