2005 caravan 3.3 no spark from center coil

need some help,coil pack replaced last week.ran great for one week.now center coil of coil pack no spark,does anyone have diagram coil connector wiring.haynes manual gives no test procedure for coil voltage and signal to each of the 3 coils.thanks in advance.

Try Ohming the coil.They should all ohm the same or pretty close.Remove wires from first 2 on coil pack across from each other.Then do the same with the rest.We had a bad run of coils a few years ago.They lasted any where from a few hours to a few weeks.They were mostly NAPA coils.Rocky

DAMN Rocky ...I am iMpressed with yerr knowledge of the later-stuff ..... I thought that you only worked on vehicles in your own era ....aka pre 1900's !

swapped coil out this morning same symptoms.ck'ed continuity from pcm to coil pack had continuity to all 4 wires to the coil.i need to know what wire is the pcm signal for center coil.thanks for the input.

Just read your original post. You may have a bad driver in the pcm.