It sounds like there could be an issue with the electrical connections or wiring related to the starter motor in your car. Here are a few things you can check to troubleshoot the issue:

1. **Battery**: Make sure the battery is fully charged and in good condition. A weak or faulty battery can prevent the starter motor from receiving enough power to turn the engine over.

2. **Starter Solenoid**: Check the connections to the starter solenoid to ensure they are tight and free of corrosion. A faulty solenoid can prevent the starter motor from engaging when you turn the key.

3. **Ignition Switch**: The issue could be with the ignition switch itself. If the switch is faulty, it may not be sending the proper signal to the starter motor. You can try turning the key while listening for any clicking sounds near the ignition switch.

4. **Wiring**: Inspect the wiring that connects the ignition switch to the starter motor. Look for any signs of damage or wear that could be causing a poor connection.

5. **Security System**: Some cars have security systems that can prevent the engine from starting if they detect a problem. Make sure the security system is not activated and causing the issue.

By checking these components and connections, you may be able to identify the source of the problem and resolve it. If the issue persists, it may be best to consult with a professional mechanic for further diagnosis and repair.