Put your voltmeter leads on the battery+, and on the red wire* at the alternator. This voltage should be close to 0v. My bet is that it's ~.75v, or exactly the amount your voltage is above what it should be.
(battery should be 14.4v. If you're seeing 15.2v, you would see 0.6v with this test. This is the culmination of all the voltage drops from the battery to the red wire at the alt)
*For stock non-hacked systems, this is the blue wire.
If you ever find yourself in a fair fight, your tactics suck.
)