Diesel 911, Thanks for the tip. My starting this thread was to provide a DIY covering what I learned. As I mention above and many others in this forum, the fuses are often culprit. They may look good, but they could be oxidized. It really is best to buy a large box that includes all amperage's and replace everything, keeping spares in the glove box.

I have also gone through, cleaned and rebuilt many of the switches on my W123, 124, and this 126. Again, helpful advice.

Another point of failure is the plastic slider in the regulator assembly. My left rear window comes loose from the regulator and drops into the door if lowered too far. An inexpensive replacement can be installed if you are crafty enough to figure out how to "peen" over the new pin. I still have to perform this task. I have a DIY coming for that.

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83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.