Not sure if this helps, but I had an electrical problem with one of my BMW's when it wouldn't stay running and when I hit the brakes everything went haywire. I knew it was a charging problem so after replacing the battery, alternator, ground cable and battery cables the culprit was the battery light in the dash. That light that comes on when you turn the key before you start the rig. That burnt bulb was the missing link to complete the charging circuit. I was pissed, but at least figured it out. Have no idea if AMC/Chrysler did the same thing in the Jeeps, but its worth taking a quick look to see if there is a battery light in your dash when you turn the ignition on.