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The starter relay in the 2008 Mercedes S550 can be found under the hood in the engine bay. It is located in the fuse box there. To access the fuse box, open the hood and look for a black box along the right side of the engine compartment with a seam around it. Inside this box, you will find the fuse. The back of the box lid will have a diagram showing which fuse corresponds to what. If the diagram is not there, you can reference the car's owner's manual. Once you identify the needed fuse, remove it from the box. Check if the strip of metal connecting the two sections of the fuse is intact - if it's broken, the fuse is no good and needs replacing. If the strip is intact, the fuse is still good to use. New fuses are inexpensive, typically costing around $10.
The 2008 Mercedes S550's starter relay can be found under the hood, specifically in the engine compartment.