I'm not on the Ritter-Easley list (their subscription form has been down for a long time), but I certainly believe in the "replace alll of the fuses" theory. When I did that in my SL last year, certain strange things went away, never to come back. I bought my 300SEL a little over a month ago and that was one of the first things I did to it. I still have some strange electrical quirks, particularly in the power seats. Sometimes they work and sometimes they don't.
For eletrical components in the doors, you might check the rubber accordian that protects the wires as they go from the body to the door. That seems to be a common problem.
When you can replace nearly all of the fuses for about $10, it doesn't seem worth the time to meter them. This is coming from a guy who will meter AA batteries before throwing them away.
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino