My son changed the battery in my 06 FX35, I think he put the wrong cable on first, negative instead of positive, said the positive was shocking him when he was putting it on, anyway, now it won't crank. It will turn, kind of like if you are using the wrong key, it won't fully crank up. The key fob registers, will lock and unlock the doors, when I am using it, the green key light comes on that is on the dash. I had NO problems before he changed the battery... Please help!!! I was told it could be the ECM relay in the third fuse box behind the battery.