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How much current flows through the alternator brushes?

I’m studying to learn how to be a mechanic. One thing I need to know more about is how the alternator works. For example, how much current flows through the alternator brushes?

avatar
Nick Kunze · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
The amount of current flowing through the alternator brushes is two to five amps.
The alternator turns your car’s mechanical energy into electrical energy, recharging your car’s battery while the engine is in use. An alternator brush supplies current to the alternator’s rotating engine through continuous connection to the slip ring motor.
The alternator brush is made of graphite and should last 120,000 miles or more before needing to be replaced.
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