Is there a fuse for my license plate light bulb on my 2000 mercedes benx s500 ?

Fuse gone check
check wiring and make sure you use proper bulbs

Head lights are not fused.

The licence plate doesn't have a fuse, it comes on when you put your lights on, if you have your park lights on and the plate light isn't working then generally it's just a bulb, see what you can find, cheers good luck

Check the brake bulb socket for short , clean replace bulbs , check connector to rear licence plate lights . Also trailer harness for short , all on same fuse circuit .

Typically the license plate light will come on with the running lights....if all the other lights are good I would suspect a bad bulb or trouble at the bulb holder....
Take care.

license plate bulbs? these run off of the park lights and that fuse is located in engine comprtment there is a box up around master cylinder area on the left fenderwell

They are on the same fuse as the parking lights. If they work, start looking for bad wiring, or corroded sockets

The back up lights may be on a separate fuse from the tail lights. The license plate light should be fused with the tail lights though. The bulbs are good on the license plate light too? Did you have the ignition switch on when you were checking the back up lights? It could be the neutral safety switch is out of adjustment or the switch is bad. Does the car start OK in both neutral and park? If so the switch adjustment is probably good, but the back-up light portion of the switch could be bad. That switch is located on top of the transmission, about right under the master cylinder for the brakes. You have to disconnect the shift cable lever from the trans to get the switch off.

check ground wire and clean bulb socket and contact points well with a high # grit sand paper

If you have a owners manual then the method is described there.