Alternator Commutator End Bearing

Critical For Operation

Charging System

Supports the rotating shaft of the alternator to reduce friction and wear.

The commutator end bearing supports the alternator's rotating shaft, reducing friction and ensuring smooth operation, which allows the alternator to generate power efficiently.

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Typical part cost

$20–$80🔒

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Typical labor cost

$100–$200🔒

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Typically lasts

80,000–150,000 mi

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Or about

4.0–10.0 years

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DIY difficulty

5/10

⚠️ Owners Often Notice

If the Alternator Commutator End Bearing is starting to fail, these are the signs owners most commonly report before it gets worse:

Alternator noise

Dim lights

Electrical accessories not working

Battery not charging

Vibration

Battery draining