Right rear tail light not working And turn signal

The turn signals and brake lights use the same circuit and filament in the bulbs. The tail lights are on the other circuit which comes from the headlight switch.
Do you have power on the tail light fuse ?

Then you need someone who can,like a repair shop

need more ifo

Sounds like you lost the ground to the rear lights.

check the bulb there some bulbs have two elements in them the turn signal element might be broken change the bulb

first of all check and confirm whether in the fuse box separates the left from right side and see for blown fuse. or check for any disconnection on the rear light

My 99 SLK230 had the same issue. Looked into it and found that there was actually a recall on the tail light assembly because of this exact problem. Granted it was the driver side tail light but you may have the same issue. Hope it helps!

you prob got a trailer plug prob bad wires if not tail lights run through turn signal switch tell fix ya bout me ok

Rear lights are double filament bulbs one side for the lights other side for the brake/turn signals so it still may be a bulb. Do u have a test light or volt meter you can check to make sure u have power there when brakes or turn signals are activated. Or just try another bulb.

There was a recall on this, take to the dealer and they will replace the whole socket on this.