I am wondering what the small "two" fuse box is infront of the main fuse box on my 190e 2.3. It is a little rectangular box with a cover and has two wires coming out on each end (one with blue tape and other wire with white tape) and it has two spaces for fuses inside (not sure the amp rating of them). I noticed a while ago that one of the fuses is missing and I'm wondering if its supposed to have a fuse in it or not...

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1992 190E 2.3
150,000 Miles