I want to pass along a test suggested by someone elsewhere. Performing that test was downright entertaining. They said "try turning on the defrost grid and then connecting a test lamp to one side of the grid. With a bit of aluminum foil in between, slide the tip of the test lamp along the grid wires and see when the lamp turns on or off (at a broken grid wire)".

I just did something similar. I connected the test light to the ground I was using and then tested from left to right using the light tip on the foil. The results are these:

All along the left (powered) side I got pretty much continuous light as I moved up/down along the vertical strip that is under the wire connection.

However, as I moved away to the right an inch or two at a time and moved up/down across the individual grid wires I found that only a few got light at even 2 inches away from the left side strip. None of them got any light by half way across the window.

I cannot say 100% for sure, but at one point crossing one of the grid wires maybe 2-3 inches from the left side strip I thought I witnessed a small wisp of smoke rise from the foil and disappear. That was way cool but not likely an indicator of anything good :-)

It was also suggested to check out frostfighter.com and I did. It does seem that they offer just their stick-on kit and I MAY have to resort to something like that. But I suspect application with the window in place will be difficult. It might be better to just get a new rear window with a new defroster grid on it.

Thanks!