Ignition Coil Power Source
WARNING: This page is about a different car, the 2003 Jeep Wrangler, 2003 Jeep Liberty, and 2003 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition on. Using voltmeter, check voltage between terminal "B" and ground of each ignition coil plug. Battery voltage should exist.