How to wire 12v Converter w/2 blue, 1 red, and 1 white wire

For SCHOOL purposes measure voltage blue wire to blue wire. 0 voltage? It won't hurt a thing to parallel them. Be aware in a saturated transformer system adding ANY FORM of capacitance on the ouput will automatically raise voltage. When these brontosaurus walked the earth giant stereo systems for cars did not exist. Connect a boom-thump audio amplifier to a ferroresonant charger and the regulated voltage will soar. Been there done that...