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The AC is then sent to the rectifier bridge and it is located inside on the back wall of the alternator. The job of the rectifier bridge is to convert the stators AC voltage into DC voltage. Inside the rectifier bridge there are six diodes (three positive and three negative). Since the AC sine waves go negative and positive you need to convert both sides. So if you have a 75-amp alternator then the diodes in the rectifier would be rated at 25 amps each negative and positive. The larger the amperage of the alternator the bigger stator winding and the bigger the rectifier bridge needs to be to accommodate the power and not short out.