The left license plate light will not turn off when car is turned off. Why?

Thank you for your reply. My husband took the bulb out last evening because I was afraid it might wear out my battery. I can have this repaired on Monday. Do you feel it is safe to drive until then?

Probably. I'm guessing you'll blow a fuse if it shorts to a ground wire.

Thank you for your reply. No other lights are staying on when the car is turned off. The right license plate light is now not working at all.

That's a strange one for sure... Good luck with this!!!!!.. It's most likely going to be shorted to battery 'power' that feeds the trunk light switch..which has power at all times. The tag light circuit must be open form the original light circuit... OR... ALL park lights would be on!.. Let us know the outcome.