Hello, Bazar01: You can absolutely rebuild your alternator. Do not get a remanufactured one, rebuild yours. Having said that, I firmly believe in having them rebuilt by those who do it for a living and possess the fund of experience and knowledge to make sure all issues are addressed in the rebuild. They have equipment that is way to expensive and not practical for a homeowner to buy. They would be testing the rectifiers, for one thing. There are ways to see if they are starting to fail, for example. When one of those goes, the alternator cannot recharge your battery or supply the correct current to supply your vehicle's needs. Another thing they would do is test the output of the alternator under a load and without a load, and perform tests to make sure it functions properly. Lastly, they can tell if the armature needs to be turned, which usually is a good idea, or whether it is too worn to turn, in which case it must be replaced. Simply replacing brushes does not give you a free pass out of jail on this particular issue. The armature (or stator) has windings. These heat up and the insulation can melt or otherwise deteriorate with age, causing the armature to malfunction. Usually it manifests itself as lower output, not necessarily a complete failure. So as you can see, you can backyard this project, sure. But why even spend your own valuable time on it if you miss something and this thing pukes on you half way up Pikes Peak or Siskiyou Pass? Or coming home in a rain storm? You should have an auto electric shop somewhere around where you live that will take those parts you ordered and test this thing and put in your parts for you and give you something that is sure to work for as you say "another 100K".