Did purchase the brushes for the alternator and changed them. Took me about 30 mins to replace the ones in the alternator. The ones still in there looked about 1/2 way worn or just a little more. However, the comutator had ridges worn into it. I cleaned it up with some emery cloth, replaced the brushes, and reinstalled it. Worked great. Didn't actually test the before and after charging voltage but the gauge on the dash is running higher than before.