That is easy to answer: Sicherung #1, Sicherung # 2 etc. so S is the
abbreviation of "Sicherung" which is the German word for "fuse"

On Sunday, May 13, 2012, Rocket J Squirrel <camping.elliott@gmail.com>
wrote:
> Okay, I've been looking at the wiring diagrams in Bentley long enough to
> realized that I just have to ask why the fuses are labeled "S1", S2",
> and so on.
> --
> Jack "Rocket j Squirrel" Elliott
> Bend, Ore.
> 1984 Westfalia. A poor but proud people.
> 1971 "Ladybug"-brand utility trailer ca. 1972 from a defunct company in
> San Clemente, Calif., now repurposed as The Westrailia.
>