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I need to know the amps on my alternator. I need to up grade due to my car audio. I was told to use a 9c1 alternator and put in a extra battery cause its more amps than my stock one.
 

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That's just a rating. My 9C1 alternator put out 174 amps at 2000rpm. Have yours tested by an electrical shop to find out what it's actually putting out.
 
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