Interesting combinatioon of symptoms, do they all go off and on at the same time? Or do these items actuate independently?
The first thing that comes to mind is a failing ignition switch; these accessories are all powwered up by an ignition accessory circuit somewhere (when you shut the key off, all of these items should be turned off by the key). The part that puzzles me soemwhat is why they would all come on in the first place, even though they share a power circuit?
Jeeps are known for multifunction switch failures giving weird problems with lights and wipers, but this would not affect the radio.
Body controller problems also come to mind, although this would not affect turn signals or radio.
I would suspect possibly more than one problem; possibly a failing multifunction switch in teh steering column, and possibly some sort of ignition switch circuit problem. If the items you mention actuate at different times, this would also tend to indicate possibly more than one source.
If in doubt, why not ask the seller if you could have the vehicle diagnosed at a Jeep dealer prior to completing the purchase?