My friend had this problem in his car(not jeep but maybe the same problem). when he wired it up, he hooked up his memory wire(yellow) to an ignition on power wire. the problem he had was he manage to get on a light circuit. This wire ran one voltage for DTR lights and more power for headlights. He didn't have an issue for two or three weeks. the first time he pulled the knob for lights the radio smoked for a couple of seconds. after this it would not smoke but he would pop the horn/cig lighter fuse.
So if I were you I'd pull the radio and check for melted wires.