1. Faulty wiring: The wiring harness that connects the license plate and tail lights to the rest of the electrical system may be damaged or corroded. This can prevent power from reaching the lights, causing them to not work.
2. Faulty switch: The switch that controls the license plate and tail lights may be faulty. This can prevent the lights from turning on when they are supposed to.
3. Water damage: If the trunk of the car has been flooded or leaked, water may have damaged the electrical components that control the license plate and tail lights. This can cause the lights to not work properly.
To troubleshoot this issue, you will need to inspect the wiring harness, switch, and electrical components for any damage. If you find any damage, you will need to repair or replace the damaged components.
Here are some additional tips for troubleshooting this issue:
* Check the fuse box to make sure that the fuses for the license plate and tail lights are not blown.
* Check the bulbs to make sure that they are not burned out.
* Check the relay that controls the license plate and tail lights to make sure that it is working properly.
* If you have access to a voltmeter, you can check the voltage at the license plate and tail lights to see if there is power getting to the lights.
If you are unable to troubleshoot and fix the issue yourself, you should take your car to a qualified mechanic for diagnosis and repair.
