I appreciate the time and detail that you are providing. It is apparent you are trying to teach me over a very difficult medium (a forum) with the tools available. I really am thankful.

I just want to make it clear: I understand the theory (V=IR, In a series circuit the summation of Voltage drop at individual elements is equal to voltage applied to the entire circuit)
I understand the general methodology (apply dmm leads in parralel i.e. across element you want to determine Voltage drop on, looking for voltage draw at element while cranking, this is done sequentially on each element ).

I don't know the specifics of application for an '83 300sd, primary ignition circuit (e.g. nss, and ignition switch). I don't know where connect my leads to execute the test. Thats all I dont know about this test. Thats what would be helpful.