My fight continues with the #3 fuse in my 1979 300sd with 160,000 miles. Please see this link for the full saga. By the way the horn starting working again??? Please P E H or anybody else with a 116 please chime in. This fuse problem has me baffled. I want to fix it right and not just run fused power line directly to the blower motor. I also think that the heat is not working.

http://www.peachparts.com/shopforum/showthread.php?threadid=93366

there is a climate control amplifier behind the glovebox.this board is loaded with transistor drivers.i beleive this board is on the same circuit.try disconnecting and see if fuse still blows