how do I know if I bought the right alternator for my car?

If the battery is charged and it won't start, the alternator is probably not the problem.

I am single working mother and can't afford to keep paying these ppl..oh geez guess I better think of what else can be the problem..

Thank you Soo much..this is very helpful. The man who sold me this vehicle has not told me much..he won't answer my calls..Another Friend of the family mentioned something about the command start..do u think the command start can have anything to do with all this?? A mlfunction or something lol it sounds weird but never know right??

What happens when you try to start it?

It just makes a few clicking sounds..but does not turn over..

At first I was sure it was the battery..so I went exchanged it..not making a difference..I also bought an alternator thinking that was the problem..but waiting for someone to come over and fix that for me...it's frustrating..

Have all connections checked for corrosion especially the battery and starter connections. If they look corroded or are even slightly loose they will not allow enough power to get from the battery to he starter.