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I only see the one picture for the right side (grounded). I know I had a picture myself somewhere, so I went pawing through the pile, but only found one from a 244, not my 242. I'm pretty sure the wiring for power comes in on the port side and ground is on starboard on all body styles, but that's not so important as seeing a 10-12V difference between the sides.
We've had three 83 240s which all had a timer relay in the rear window heater. My map for the 82 shows just a switch.
My approach would not be to probe the film. I'd slip and scratch right through it and then kick myself up the stairs. Instead I'd poke a sharp needle through the vinyl sheath on the copper strip connecting the window to the wiring.
In the past I've had some luck moving a small compass over the grid from the outside to see how many were still working. It is tricky because the compass wants to be level for its bearing to work freely.
PS if you've a satisfactory conclusion to the light switch story, never mind, but if not, update your thread, and I'll return to it with a bunch of pics I found from when I restored an original (old type) switch. I seem to recall some forum dissatisfaction with the aftermarket replacement part.
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Art Benstein near Baltimore
"Feel free to point out my ignorance but don't insult my intelligence."
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