I tried to put in a new fuse with the ignition off and it blew instantly. There's always power going to it so I'm thinking it goes to something else besides the aux fans. I tried to follow the wire but it goes under the master cylinder away from view. It looks like I'm going to need to look at a wiring diagram as you suggested Gilly. If you end up getting your Adobe Acrobat working hopefully you can post the diagram.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500