My first guess would be ... somewhere in the fuse box ?
You might want to give a bit more details (type of car etc.)
The tail light fuse is located in the fuse box which is located in the glove compartment. The tail light fuse will be a red wire.
The tail light fuse panel for the Subaru Impreza WRX located in the fuse box.
The 1997 Pontiac brake light fuse is located in the fuse box. The brake light fuse will be labeled as the tail light fuse.
The tail light fuse can be found in the fuse box. The fuse box can be located in the engine compartment. The location of the tail light fuse is listed on the inside cover of the fuse box. The tail light has three wires.
The 2002 Mitsubishi Gallant tail light fuse is located in the first column of the fuse box. The tail light relay switch is also in the fuse box, at the top of the third column.
eassy pull the fuse box cover off turn it over located the tail light fuse pull it out replace with same amp fuse
The fuse is a 15 amp located under the hood close to the battery.
tail light fuse Toyota86 Cressida
The fuse box is located on the driver side, open door and look on the left side of the panel. There you will find the fuse box. You will have to look for the tail light fuse, but it is there.
The 1985 Chevrolet have blazer tail light fuse can be found in the fuse box. The fuse box is located beneath the drivers side dashboard.
It is Fuse #14 in the fuse box located under the drivers side dash
The dash light fuse gets its power from the tail light fuse. If the tail light fuse blows, you won't have any dash lights either.