You really should look at the wiring diagram posted in this thread but from what i remember and i could be wrong.
Standing on the driver's side of your truck looking at the PCM the #3 plug is on the top left. The #1 wire is top right and i think it was green.
Standing on the driver's side of your truck looking at the PCM the #3 plug is on the top left. The #1 wire is top right and i think it was green.