Wont start, please help!

[Gastank]

While you have the multimeter out.... Jump the jeep off and remove the jumper cables. you should see between 13.3 and 14.4 volts DC at the battery. I have had a diode in the internal regulator go bad, the battery allowed me to drive to work but the alt wouldn't charge the battery. There is also a fusable link somewhere in that system Just can't remember where. Could just be the cabling or the ground but there's a couple more things to check for you.
Good luck!

[mallcrawl]

if you already have the replacement type terminals that the wire is clamped onto the terminal bt a couple bolts take them apart and clean the ends of the wires as well as the terminals.

[CaptORM]

Ok now for future protection check this:

There is a cable that runs from your battery to your fuse box.  Where that cable mounts to the fuse box loosen the bolt and run a wire brush around the connection.  Then tighten the bolt back down.  Ive had a bad connection on that mount several time. 

[rocket]

Ok, now that you have read all the various suggestions, have you fixed it yet?  What was the prob?

[footman]

Boy do I miss my garage!!!  I was out in the dark cold rain cleaning the cable ends.  The positive bubbled way more than the positive.  I greased them up, reinstalled and .................................................................VAROOOOOOOOOOOOOMMMMMMMMMM!    Its alive, its alive!!!!!!!!!!  Thanks again guys for the info.

Ummm didnt you read it?

[rocket]

missed it, sorry.  I always click the last page and unless it looks like i missed something by the first post on the page, i usually dont' go back.  I interpeted gastanks's post to be another suggestion to find the problem. oops!