electrical problem

I had a something very close to your problem, What I finally found out was the battery cables , which are one piece types, they bounce around somewhat and my cables were broken, just enough to cause this problem. The break will be at the end of the cable close to the terminal. To fix you will have to saw the terminal off the cable, then replace the terminal with aftermarket type (cheapest way) . This fixed mine, although unless looking for specifically you would not notice it Good Luck

I have a 2000 jeep grand cherokee when you turn the ingition switch on the window come down an when u start it up the windows wont come down all the tachs fall an the key light flash