alternator problem?

Hello compis.
I have explained you.
I have an Xsara 1.9 Turbo Diesel of 98, I changed the alternator because I turned on the light of the battery until I no longer started (I stayed without load) I put a new battery and went to the scrapping and I bought an alternator and everything went well, but I noticed that the belt was not tense at all I went to the workshop. But when I get the car pulls me.
HEADS WHAT THE ALTERNATOR IS FACKING OR SOMETHER?

Hello, I tell you the car you have is a machine really does not throw it, it is possible that you have the danper of the craninal in Spanish the crankshaft pulley proves to put the lights the air the thermal window ý proof of whether the light is, look the run the run if it gira

Hello, as the partner said one of the probability is that the Sigual pulley will be shown on the rubber that is stuck, but the problem is the rectifying plate they sold you a failed alternator

First of all, Gracais for your help
that pulley that you tell me I do not know what it is, but tell you that if they change a black plastic pulley (it is that of the tensor) because a grimace was made and for fear that I cut my belt if I change it to me the workshop, but there is another aluminum color pulley that made a little very little noise when giving them turns with my hands, although I do not think that it is

. I fail all day and the next day does not stop failing.