Electricians use a type of paste when joining copper and aluminum conductors to prevent an electrolytic reaction; the same stuff (in tiny amounts) can be used on the (aluminum) strip fuse to prevent it from corroding. Ditto the added-on strip fuse for the climate control blower in the W124 cars (and others?).

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970