probably because there is a bad Ground-clean the socket where the bulb goes & coat w/vasoline & if there is metal on the socket housig ,clean that.That is IF U have 12 volts going 2 the socket-the tag light work with the running lights.
this light is called the license plate light
you buy a new one
The license plate light circuit is protected with the tail light circuit fuse.
It is very easy to change the license plate light on an Oldsmobile Aurora. All you need to do is remove the license plate and look above where the plate was. There are bolts that are holding the light in. Unscrew the bolts and then replace the light.
The 2001 Toyota Camry license plate light fuse can be found in the fuse box. The license plate fuse will be labeled as the tail light fuse.
A Chevy Tahoe's license plate bulb can be used to light up the license plate. In the dark the license's plate will still be visible.
( bulb # 168 ) for a 1996 Ford Mustang license plate light
how do u change the license plate light on a 2005 sienna
what about it?
Yes, all cars have a license plate light. It is mandated by law.
on the 2001 XZ3 I removed the license plate and used a flat head screw driver to slid the license plate light cover over and they "pop" out.
If your license plate light is out change the bulb in it, if you have taillights your fuse is good as the license plate light uses the same fuse as the taillights.