Punisher6
Member
Had the same leaking problem on a 2001 and a 2000 expedition. Both very different problems. The 01 had a sunroof and the drains were clogged. Opened them and the problem was fixed. On the 2000 no sunroof but the body deal on the roof was the problem. This one took me the longest to find. When it got wet the lights radio and most everything in the expedition would come on. Had new windshield installed, took it back and had it replaced and resealed still leaked. I finally took a day to solve the problem. The seam on the roof where it meets the side of the vehicle was the problem. I sealed it From back to front on both sides problem solved. Hope this helps.