In my car the fuse for cigarette lighter for front and rear is no. 26. Check on your car under the cover of the fuse box. There are the details for the fuses. For my car only the 2 cig. lighters are covered by this fuse, nothing else.
If the fuse is o.k., stick a multimeter into the cigarette lighter and check if the voltage comes to there. I always use the cigarette lighter socket for checking battery voltage and charging voltage with a multimeter. No need to open the bonnet and very effective and quickly done.