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. Before the generator (alternator) is disassembled, it is spin tested and connected to a scope to check for possible defective components. . . . The scope pattern shows that the voltage output is far from being a normal pattern. This pattern indicates serious faults in the rectifier diodes. . The first step is to remove the drive pulley. This rebuilder is using an electric impact wrench to accomplish the task. .
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1. GM CS Alternator Overhaul Jim Halderman
http://jameshalderman.com