Re: 05 WK wont start!
sounds like a connection at the battery, that said weak batteries cause all sorts of issues on the WK... I would remove your battery cables and clean the posts. TYPICALLY when a car wont start on its own but a will with jumper cables it is an indication of high resistance at the battery post... the jumper cables have a good connection so it uses the other car to assist with the start.
That said, a *click* is also very indicative of a failing starter solenoid.
2005 Jeep Grand Cherokee - Gone but not forgotten!