[LittleHoov]

You havent mentioned any checking for spark. You seem to have an idea of what youre doing, so I assume you have. Thats the only thing that comes to my mind.

I think your Jeep still has spark plug wires, makes it sooo much easier to check for spark. I know some of the later ones moved to coil on plug, so theres not a good way to test that kind of thing.

I have heard people comment about a bad alternator causing a vehicle not too start, ive never bought into that theory though. Plus if your battery is good, and youre trying to jump start it, it should be getting more than enough juice between the two.