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i've had a lot of success repairing toyota alternators. if the car has 150 to 200k miles on it and it won't charge the battery, it's usually the brushes that have worn out. replacing them will do the job about 90% of the time in my experience. the slip rings on the rotor will wear out but not as fast as the brushes, which are made of carbon. find an auto electric shop that sells alternator parts and they should be able to sell you the brushes with the brush holder for around $10.
if it is noisy or frozen it's not a simple job, bearings have to be pressed out etc.
good luck
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