If it shuts off again, wiggle the ignition key and see if you get any activity. Mine did that before and it was in the ignition. I could wiggle the key and it would reignite. Or, just turn on the key, wiggle it, and see if gauges etc... start to blunce around.
98, I6, 5spd, 4" Lift, 33's and a few other mods that get me there.
Tow rig - 12 F-350 4x4