Nathan,
The vaying Voltage readings may be a grounding problem, or it may be a matter of not making a good connection to a somewhat oxidized or corroded terminal when you were making the measurements.
A measured 13.0 Volts is not high enough to meet factory specs, but it may be a case of a meter reading slightly low.
High Voltage output can only be caused by a faulty regulator, so readings of 15 - 16 Volts is definitely indicative of a faulty regulator!
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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