I have a 2001 Grand Cherokee Ltd and had the same problem this afternoon. The engine would tick repeatedly when trying to start it and it wouldn't turn over. A friend jumped it and I let it charge for a bit, but later it still would just tick the first time and then do nothing when trying to start it. My battery also had a pretty good amount of corrosion on it. That apparently was the problem. Just wiping off the terminal and post won't do the trick. My friend happened to have a post and terminal cleaner.
It definitely did the trick, though it did have to be jumped one last time to get it going, but after driving on it, it's doing fine restarting. Apparently sand paper on the posts and terminals works well too. Just anything to grind the lead down through the corrosion. That may not be the solution for you, but I would certainly try it before spending lots of time and money on a new battery, etc.
Monday, August 4th, 2008 AT 8:38 PM