First I want to thank everyone who helped with my defrost problem.
What I found was, at the rear of the pillar trim was what appeared to be a
clip that held the trim on. This is in reality the connection to the heating element, corroded of coarse. There was power to the clips (driver side hot passenger side ground) After cleaning the connections I now have current flow, about 6 volts after the heating element. I ass-u-me that this is due to the resistance of the heating element. Now if it would just get cold enough to test the defrost. Oh yeah the clips go in between the window and the seal, just pushed in!

Jon J
1981 240D