There's several possibilities
Turn the key to run, engine off. Hook your voltmeter, one probe to the battery positive, other probe to the blue wire on the alternator. You are looking for a VERY low reading, the lower the better. Over 1/2 volt is way too much, and it should be less
Im getting .8volts when running this test, The other test seemed inconclusive, the meter was jumping all over the place, mostly in the negitives.
What do i do now?