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I changed the alternator and car wont start now what do you do?

Here's what you can do if your car won't start after changing the alternator:

Troubleshooting:

1. Check the Connections:

- Ensure all electrical connections are properly made. Recheck the positive and negative terminals on the alternator and the battery. Make sure they are tight and not loose.

2. Battery:

- Verify that the battery has sufficient charge. A weak or dead battery can prevent the engine from starting.

3. Belt Tension:

- Check the tension of the serpentine or V-belt that drives the alternator. If it's too loose, the alternator won't spin fast enough to generate electricity.

4. Wiring Issues:

- Inspect the wiring harness that connects the alternator to the battery and other electrical components. Look for any signs of damage or corrosion in the wires.

5. Starter Motor:

- While the alternator is not directly involved in starting the engine, a faulty starter motor can prevent it from cranking. Check if the starter motor is engaging and functioning correctly.

6. Computer Reset:

- Disconnect the battery for a few minutes to reset the car's computer. Sometimes, a computer reset can resolve electrical glitches related to charging system components.

7. Professional Assistance:

- If the above steps don't help, it's best to take the car to a professional mechanic or auto electrician. They have the expertise and diagnostic tools to accurately identify the root cause of the problem.

Additional Tips:

1. Check for warning lights on your dashboard when you turn the key. Any warning lights may indicate an additional problem that needs attention.

2. Before starting the car, turn on electrical components like headlights or the radio. If they don't function properly, it could be related to the electrical system.

3. If you have a multimeter, you can test the alternator's output voltage and the battery voltage to assess if they are within the normal range.

4. Avoid starting the car with jumper cables for an extended period as it can strain both the new alternator and the battery.