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Why wont my 91 geo storm stay charged after replacing alternator?

1. Incorrect Installation:

- Ensure alternator, battery, and wiring connections are correct and tight.

2. Voltage Regulator Failure:

- It may be faulty or damaged during installation.

- Test the voltage regulator or have it inspected by a professional.

3.Wiring Issues:

- Check the wiring between alternator and battery for damage, corrosion, or loose connections.

- Verify the ground wire connection between alternator and engine.

4. Battery Problems:

- A bad battery may prevent the charging system from working properly.

- Test the battery to confirm its health.

5. Internal Alternator Malfunction:

- Despite being new, the alternator may have internal issues.

- Consider getting it tested or seek warranty support.

6. Faulty Diodes:

- Defective diodes within the alternator prevent proper charging.

7. Belt Issues:

- Verify the serpentine belt that drives the alternator is in good condition and properly tensioned.

8. Computer/ECU Issues:

- Rarely, problems with the vehicle's computer or Engine Control Unit (ECU) can impact charging.

- If other checks yielded no results, consider consulting a mechanic for electrical diagnosis.