I think you should be between 13 1/2 and 14 1/2 volts, but 15 isn't all that uncommon. My 66 runs about 14 1/2 most of the time, but with out any accessories on, I can see 15 volts. Any more than this and you should worry about over charging the battery. You might try a new regulator, and see if it sets you up a little lower.
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