Rear window defogger soldering

Hello, Major problem. I am ordering the rear window defogger repair kit as suggested. As I said, after I soldered the driver's side plate to the rear window, the wire within the window that goes from the top of the plate passenger's side to the top of the plate driver's side was the only wire heating. I felt that wire with my finger and it was slightly warm but not hot. Today, with defogger kit on order, I briefly turned on the defogger because the rear window was fogged, so that I could warm that middle wire. Then, "kablewy", the back window blew out! So now I need to replace the entire back window. Oh well, do-it-yourselfer lesson learned. I am having a repair shop put a new window in on Monday. I will warn them. I hope everything electrical is okay. I don't want the newly replaced window to blow out next week. I will make sure the plate on the purple wire (passenger side), and plate on the black wire (drivers side) are nice and clean. Do you have an idea of just what happened? Do you have any suggestions prior to rear window replacement? How should I test the defogging ability of the new rear window? Thank you