Sounds like you may have the bulb in wrong. Check it out with another bulb that is working.
do you have an aftermarket security system installed in it?
I have same problem.
I'm guessing your stereo is aftermarket. If so, then whoever installed it did it wrong or tried something tricky.
Neon lights
The only difference between LED lights and normal lights is that LED lights are much brighter and are a brighter white than normal lights. Some find the brighter lights better, while others find the lights too bright.
There is definitely a way to make your HID lights brighter. To make your HID lights brighter, you can purchase and install xenon projectors or specifically designed reflectors. You also have the choice of upgrading your reflectors to halogen headlamps to make them even brighter.
In most states any installed light has to work. All the lights normally on your car from the factory must work plus any aftermarket safety light such as fog lamps need to be in working order.
The little nozzle on the side by your head lights adjuster ;)
if your illumination wire is bare and touching the radio it will short it out
lights are required to be installed on every trailer
Bulb installed incorrectly? They are double filamented with the larger for the tailights and the smaller for stop lights Socket has a bad ground?
Fabrication.