Reattaching tab on rear defogger

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They are soldered to the grid before it is attached to the glass. The hard part is usually getting the parts clean as the pad on the glass is very thin. I use a brass brush and gently clean the glass tab. Then scrape the connector to clean it. Next apply some extra non-acid flux. Then heat the tab and tin it with rosin core solder. The next step is to hold the tab in place on the glass and heat it only until the solder melts and sticks. Don't hold the iron on any longer than needed and don't use a low power iron, you want it to get hot fast, melt and then get the heat off to avoid damaging the rest of the track.

You are welcome. Localized heat can do some interesting things to glass. In this case a low power iron can heat the glass more than it should, then you buy new glass. Glad to hear you got it fixed. Please return anytime with your automotive questions, we are here to help.