Ok Steve, your theory is more than likely correct. Lol. I've replaced the battery in the car because the old one was done anyway. Had been in the car for 9 years. Lol. But, the fuse is still blowing. And, it's NOT during cranking, its just turning the key to on. This makes more sense than the scenario I provided the first time. I'll start back over from the beginning so I can find the culprit. I unplugged the ECM, and the fuse still blew. I'll keep you guys posted.