Yep electrical issues are #1 problem with all of the Grand Cherokees...the 42RE transmission wasn't that great either. The 4L I6, 5.2L 318 V8, 5.9L 360 V8, and the HEMIs aren't too bad, but lots of 4.7L V8 hate, and a lot of that comes down to people skipping maintenance and some bad engineering on those valves and rocker arms self uninstalling LOL.
My 96 Grand Cherokee I beat the crap out of all the time offroad, never had a problem other than regular maintenance, and a radiator at 188k, and a starter at 197k. The viscous coupler in the transfer case failed at 232k, surprising it lasted that long given the beatings it took all the time in the mud....my 98 Grand Cherokee was just an electrical and mechanical nightmare shortly after purchase, looked like new but it had a lot of random electrical problems, a transmission that decided to start puking fluid all over my carport, and a bad low end engine knock that just progressively got worse...thought it was the typical valve train noise, but even after having the head gasket done, and a rebuilt head, the noise was there, and made it quite obvious it was a low end issue. Traded it in on the 2008 Ford Explorer that I have now...love the Explorer more, drives and rides a lot better than my Grand Cherokee.
Course if you say any of this on a Jeep Forum they'll ban you HAHA!!! Oh well, truth is they have several electrical problems, and transmission issues. Not sure on the newer WK's and WK2's but the ZJ's and WJ's had a lot of regular electrical problems, and the 4.7L V8 was a normal problem LOL