当汽车交流发电机正常运作时，会产生13到18伏特的交流电压用以供给电子设备和电子系统能量，同时给电池充电。但是，如果交流电压小于13伏特，交流发电机将无法保持电池充电。按照以下步骤自己更换交流发电机会节省很多钱。
步骤
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1
断开蓄电池电缆线。
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2
找到车辆上的交流发电机。
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3
使用蛇形皮带工具松开皮带，接着把它从交流发电机的滑轮上移下来。
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4
把支撑交流发电机的螺栓放回原处，螺栓的数量至少2个，不超过4个，规格取决于不同的品牌和型号。
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5
使用套接字和棘轮来松动并移除螺栓。
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6
卸下交流发电机，然后拔下并取出连接电气部件的所有螺母。
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7
将交流发电机从引擎上移下来，然后拿到零售店换一个新的或者从新组装一个。
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8
在零售店里要好好检查下新的发电机并与旧的那个多比较比较，确保电压校准器和滑轮相匹配。如果不相匹配，可以叫零部件商家将旧的滑轮组装在新的发电机上。
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9
相反的过程来安装新的交流发电机。
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10
把新交流发电机上的电插头和电线接上。
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11
交流发电机滑入到位后，就开始将旧的螺栓安装在正确的位置。
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12
将发电机滑轮放回原位并且把它固定好。一定要检查滑轮与皮带张紧器是否对齐。
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13
使用蛇形皮带工具来控制所需的松紧度并将皮带滑回滑轮上，接着便可以通过皮带的张力来释放工具了。
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14
重新连接蓄电池电缆线。
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15
启动车子，确保交流发电机正在充电。
小提示
- 用数码相机将移动过的地方拍下来。这将记录下每个零件改动过的地方，当重新组装时便会很容易找到各零件原来的位置。
- 在送还蛇形皮带张紧装置时，可以询问零部件商家是否可以帮忙检测下更换的新发电机电压输出是否正常。大多数商家会乐意免费帮忙的。电压至少是13伏特。
- 许多汽车零部件商家都愿意外借蛇形皮带工具，但是要收取少量押金。
- 如果很难找到蛇形皮带张紧装置，可以使用处在发动机机舱内的齿形带。
警告
- 以防电气系统短路和电子产品被破坏，在任何电子部件上工作时一定要将电池电缆线断开。*避免灼伤，在工作之前一定要确保引擎已经冷却。
- 使用旧螺钉安装新交流发电机时，在所有的螺钉还没有装上之前千万不要拧太紧。
你需要准备
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交流发电机
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蛇形带工具
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SAE标准的套接字和棘轮
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SAE标准的扳手