I cracked open my relay box on my 87 w124 and found two fuse holders (one occupied and the other empty). What are these for, and what rating fuse should I put in the empty fuse holder (if at all)? Haynes and the Mercedes Bible haven't shone any light to what they are. Thanks!

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1987 300e "200,000+ and going strong"

Should be listed on the fuse chart. I wouldn't put one in the other side. On the fuse chart I think it'll say "aux fuse holder" or like that. Am fairly sure related to climate control.
Gilly

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If you're that curious, pull the fuse out and see what stops working.

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2007 C 230 Sport.

Both fuse locations are supposed to be for the alarm system. On my car, the second slot was also blank but the alarm still works.

That would make sense considering you have to unscrew the box to get access to it. If the alarm fuses were in the fuse box, a thief would just have to pop the box open and remove the correct fuse. Thanks!

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1987 300e "200,000+ and going strong"