There used to be a Infill T3 Install Guide somewhere on this site...I can't seem to find it, but I cant remember if it had the wiring diagram. I can list what connections you will find. I am guessing you are not missing the power cord harness, but the speaker harness?
I just remembered I have a copy of the install guide at home and will take a look in a few hours. I just had mine out of the car this morning and dont want to pull it out ever again...or at least for a few days!