Most parts stores will check your alt for free. If the car still runs, drive it there. If it isn't running, remove the alt and they can bench test it.
As far as a cost, figure the alt should be under 200.00 and labor about 1 hour.
NOTE: It isn't hard to replace. You can do it yourself if you have some basic tools. If you want me to, I can provide you with the directions. Also, if you have a volt meter, here is a "how to" for checking it yourself. It is easy to do. Check if out and let me know what you decide.
https://www.2carpros.com/how_to/how_to_test_alternator.htm
Joe
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Saturday, November 28th, 2009 AT 8:31 PM