I am going to make a picture, actualy inside the black cable which goes in to the alterantor is only one cable a blue one, but also that one is not plug in.
About the voltage i could tell you guys that, when i start the engine the voltage is betwen 12.1-12.3(measureted with a multimeter) and the alternator is not charging, but after i press the gas pedall it start's charging (my multimeter shows values of 14.1 or something like that..anyway above 14)