same thing happened to me about two years ago... had to buy a new alternator.

 

When I tested the Alt on the car a few days ago, it said it was good, even with a load or drain test or whatever you call it. I took it to work today and tested it... and it only put out 10-ish volts So there goes 150 bucks

 

132456

 

So to anyone who reads this, if you have an alternator die on you, check the brushes, or get them checked. Costs about $10 to fix ($40 if you get a whole new voltage regulator) and keeps you from buying a whole new alt.

Did the trick on mine and saved some money...

Just thought I'd attempt to help someone in the near future...