Electrical circuits (Mercedes-Benz E-Class W124)

Blade fuses are used to protect electrical circuits, the color of which corresponds to the fuse protection current. The serviceability of the fuse is determined by the presence of a wire conductor connecting the fuse contacts. To replace a failed fuse, first turn off the corresponding electrical circuit, remove the fuse from the socket with tweezers. If the newly installed fuse immediately fails when voltage is applied, check the protected electrical circuit. If the fuse protects several circuits, they must be connected in turn in order to determine the faulty circuit by the blown fuse.