Hmmmm weird. Quick question: Are you using the correct rated fuse?
Double check the part numbers and make sure the connection (which is very obvious I agree) to the switch and wiring connector is correct.
Are there any signs of previous wiring work around the switch connector?
Another question: Have you tried the cleaned switch and/or the new one in another location? Such as the right-front? That would determine whether it is really switch related or not.
Keep us posted,
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)