The cost of the three options typically ranges from about $300 to $500. The replacement itself should only take about 2-hours. Add this all together, and you have a total cost for an alternator replacement of between $480 to $940.
Does a bad alternator make a sound?
Whining and Grinding Sounds
If your alternator is failing, you could hear a few abnormal noises. If you hear a small rattling or grinding sound when your engine is running, this could be caused by a loose bearing in your alternator.