Before buying a used alternator, you’ll want to ensure it’s still in working condition. Here are five ways to test if a used alternator is still good:

1. Visual Inspection: Check for corrosion, burnt smell, or worn bearings.

2. Spin Test: The pulley should spin freely with no grinding.

3. Bench Test: Use a voltmeter or take it to a local garage for a bench test.

4. Check Voltage Output: A good alternator produces 13.5–14.8 volts.

5. Ask for Warranty or Return Policy: Reputable breakers yards like DRS Car Parts offer guarantees on working parts.

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