Might be the bulb under the hood.
The bulb could be 'blown'. Remove the working bulb from the other light and try it in the socket of the one that isn't working.
Have you checked your bulbs ? The tail light / brake light bulb has 2 wires inside it In my case I have had to change each bulb because the brake light portion did not work but the tail light portion of the bulb did ( I'm assuming that your front park lights are working )
Bulb blown, perhaps?
What do you mean fix lights? which lights? Are the lights not working or does it have a broken lens. If the light doesn't work, have you checked the bulb? Is it burnt out? Is the socket in good working condition? Did you use you test light to see if it has power? Is the fuse good?
Many taillight assemblies are equipped with bulbs with dual filaments, one for tail lights and one for brake lights. If you have one bulb with two filaments, then the problem you describe sounds like the brake light filament in the left bulb is burned out but the tail light filament is working.
Is the light bulb inside burnt out. If so, that would do it.
The fog light bulb on a 2004 Chevy cavalier LS sport should come on when the lights are activated. If it doesn't, first check the fuse for the fog lights, then the bulb, and then the switch. One of these things is likely to be the cause of a light not working.
light bulb lights up london
the socket
Thomas Edison made the first operating incandescent light bulb. But in 1800, Humphrey Davy invented the electric light. It didn't last long, and was not a bulb, though. Arc lights later became popular, but again, were not in a bulb.
you fix the light on the ceiling fan by puting a new light bulb in your fan
my Oldsmobile alero did the same thing. It turned out to be as simple as a blown bulb in my tail light.