Titus Livius: Men are only clever at shifting blame from their own shoulders to those of others. Peter McWilliams: Stubbornness is also determination. It's simply a matter of shifting from won't power to will power.
The alternator replacement cost can be quite high, with prices running between $133 and $915 for a new alternator. The work itself is quite straightforward, so the cost for labor is normally quite low in comparison to other automotive services. The alternator cost will range from $200 to $700 just for the part itself! To have a new alternator fitted at a garage you can expect to pay between $172 to $1046 with an average cost in the mid $500 range, depending on the part used and the model of car you own.
Replacing a belt is cheap, and if you can do the work yourself, $35 to $75 should be the average. If a professional does the work you are probably looking at $100 to $125. Replacing the entire alternator will be more expensive.