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How do you repair an alternator?

በ Li Chenyu / hcfire360 ህዳር

Depends on what's wrong first bench test it and see how it behaves to help you get an idea of what its not doing, no output/over charging/poor output/ bad bearings etc. then disassemble and test each part to locate the trouble, install new parts, bench test to be sure it works then reinstall on vehicle after charging and testing the battery