I've had this happen many times on my 2002 WJ. When you repair this, put an extra few inches on the lead. Check your other wires for wear and fix those at the same time. It was my 3rd repair before I finally added some extra length.
The 4th time this happened, I was really upset... I pulled the boot off, inspected the wires. I attacked them with a meter, but never could find the problem.
A few weeks later, I got my tax refund and finally broke down to buy a new drivers seat (the lower frame had collapsed). When I pulled my old seat out, I was met with a shower of sparks, as the seat frame had torn up the motor control wires and grounded out.
Once I finished replacing the seat, the windows, mirrors, lights, AC, EVIC, and a couple other things started working again.
Who would have thought that a broken seat could cause so many issues.