By the way, on my car, the 30 amp fuse next to the relay box sends power to the aux fans. That's what I was using to get 12 volts to the top and bottom of the preresistor to test it. The 30 amp fuse next to the driver's side strut tower sends power to the blower motor under the windshield.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles