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It depends upon the accessories for an automobile.

1. car with just headlights, heater, wipers and etc. about 35-45 amps

2. car with AC added 65 amps

3. Newer computerized car with AC and etc 100 amps

4. car with all the above and a amplifier 140 amps (depending on the size of the amp)

5. Take note that a typical school bus with all the heaters and etc normally will be ok with an alternator from 100-150 amps.

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Q: How do you know what size of alternator to use?
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