Somewhere in that circuit (probably close to the bulb) there is a short in the circuit where two wires have crossed, or perhaps water has gotten into the light housing and is causing a "short" that blows new bulbs. (Volvos often have this problem in their lights). Carefully examine the bulb housing to make sure you are putting the bulb in correctly, that it is not touching any other metal surface in the housing, that there is no other liquid (like water) in the housing, and check to make sure all wires going to the bulb housing are not frayed or stripped. If you have had a hitch receiver installed (not likely on a Benz) or had it towed recently (sometimes they patch in a light they attach to the trunk), they might have stripped back the wires to make a connection.
Alternatively, check your fusebox to make sure the fuse is in good shape and not "open", which would cause the bulb not to light
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