Peugeot 406 2002 model - replaced starter motor and not working - get a clicking sound like a flat battery but it worked before replacement.?

If your Peugeot 406 is making a clicking sound after replacing the starter motor, it could indicate a poor electrical connection, such as a loose or corroded battery terminal or starter connection. Ensure the battery is fully charged and check the condition of the battery cables. Additionally, verify that the new starter motor is properly installed and functioning. If the issue persists, consider testing the battery voltage and the ignition system for further diagnosis.