Originally Posted by blckshdw
I would try it by putting the positive probe on the positive output of the alternator to make sure the alternator is/isn't putting out the 14.5V it's supposed to when running.
To be clear I'm correct. There is only one output of any gauge on the alternator, a heavy black cable runs from it towards the battery. There is also a plug with two small gauge (20?) wires that goes into the wiring harness. The heavy cable is connected to the positive output you mention correct?