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there are two wires at least going to alternator.one large diameter and one very small [blue i think].the small one is the exciter wire and carries 12volts to the alternator when you start the car.it goes thru the batt idiot light on the dash.when you turn on key the batt light should be on because the terminal it connects to on alternator is ground when engine not turning it is carrying 12v to the alt.when you crank car engine it excites the windings and alt makes power.turn on key and see if batt light comes on,if not 1.bulb is blown,2.wire is not connected to alt,3.faulty alt.
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