My Car Won't Start: Is It My Starter or My Alternator?

When your car won't start, it can be frustrating and confusing. The two most common culprits are the starter and the alternator. Here's a guide to help you determine which one might be causing the issue.

Signs of a Bad Starter

• Clicking Noise: If you hear a clicking sound when you turn the key, it usually indicates a faulty starter.
• No Sound at All: If there's silence when attempting to start, it could also point to a starter issue.
• Intermittent Function: If the car starts sometimes and not others, this can indicate a failing starter.

Signs of a Bad Alternator

• Dimming Lights: If your dashboard or headlights dim, the alternator may not be supplying enough power.
• Electrical Failures: Other electrical components might not work correctly if the alternator is failing.
• Warning Light: A battery or alternator light on the dashboard is a strong indicator of alternator problems.

Testing the Starter

To test your starter, use a power probe and check for voltage at the starter signal terminal. If there’s no voltage, the starter may need to be replaced.

Testing the Alternator

To verify if the alternator is functioning correctly, check the voltage output. It should be between 13.8 to 14.2 volts while the engine is running. If it’s lower, you might need to replace the alternator.

Conclusion

If you suspect that your starter or alternator is failing, it is crucial to get them inspected by a professional mechanic to avoid further issues.

Additional Resources:

• How to Test a Starter with a Power Probe: Mobile Mechanic Explains
• Ford Lock Cylinder Won't Go All the Way In: Mobile Mechanic Explains