It's a two wire plug. It also has the wire going from the stud to the battery. I've had the alternator tested and it came out fine, I was also given a new alternator to try and I had the same results. All the pulleys are stock. What I read on TGO was that the higher amp alternators produce the power during higher RPM's and a smaller pulley is needed to compensate for idle. What's weird to me is I had this alternator on my RS and I had a monsterous stereo system in it and I never had a problem with my volts dropping. In the iroc, I can be at a light with my lights on, brakes on, and a turn signal-the headlights go dim and my turn signal barely blinks...without the radio on or any other accesaories
