Screwdriver across the solenoid ignition wire and starter wire. Always hated doing that, though. I'd first suspect grounds.

Not sure how things are wired on your I4, but if I had to start somewhere, I'd polish all the electrical contacts: starter, solenoid, transmission, battery, fusebox grounds. Had similar experience a couple years ago, and getting everything cleaned up did the trick. 

-Jarrett

On Jul 23, 2012, at 10:50 AM, David Bjorkman wrote:

>  I would like to try to electrically "jump" the starter to see if it is broke (I don't think so), but havn't done that in a long time and would like a refresher from anyone out there who has done this recently.  Any other diagnostic hints would also be helpful.