.. to add to Jims observation of the common hair-line crack on that fuse, there is also a common problem on the bullet type fuses .. they look cool but do not conduct on the ends.. which is why it is advised to twist them in their socket.

... so , the point is that the best way to test a fuse on a Benz is with a 12v test lamp. Go from ground and BOTH sides of the fuse and you can not overlook a bad fuse/connection...........