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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.
bad ground or severed connection
could be the bulb is bad or the socket is corroded or the wiring to it is damaged.
Could be any number of things: * burnt out bulb, * blown fuse, * bulb loose in light socket, * corrosion in the light socket, * wire disconnected or shorted out.
Open up the hood, and go in behind the fixture where the light is located. Sometimes there is an access panel on top. Open it and reach down inside and grab the bulb's socket. Twist the socket a quarter turn counter clockwise, and pull out the socket. Grab the bulb, and pull it straight out. To replace the new bulb, never touch it with your bare fingers, as this will greatly shorten the bulb's life, if it even work's at all. Use a tissue or something else in that order to handle the new bulb. Push the new bulb into the socket, put the socket back into the housing, and twist a quarter turn clockwise to secure the socket into the fixture
Bad bulb or corroded or defective socket.
The 1999 Mercury Sable license plate light and the right side brake light are on the same fuse. If the fuse was bad neither brake light would work. The problem probably is burnt out lightbulbs.
A bad light socket, corrosion inside of light socket, poor ground connection, wire disconnected/damaged, wrong type of bulb was used or bulb was installed incorrectly.
Check for a loose bulb Check for a corroded or bad light socket
Look at the socket itself. Wires could be burnt or even inside socket corroded or burnt. The light bulb socket assembly cost around $40. It is best to change it. Pretty much self explanatory. You can wiggle the bulb and sometimes it woill work for awhile but it is a pain to keep messing with it so I suggest replacement
Bad bulb socket? Broken Wire to socket?
fluorescent bulbs have mercury in them. There are heaters at the ends of the bulb that vaporizes the mercury to allow the light to be produced ( the fluorescence on the inside of the bulb is what actually glows). If the bulb is cold you do not get the ionization of the mercury to cause the fluorescent powder inside the bulb to glow, or it just glows a small amount.