common speaker channels?

You are most likely looking at the diagram incorrectly. You should have 4 positive wires and two negative wires. Contact the manufactuer to be 100%. With a common ground radio like yours you would have to hook up both negatives on one side of your wiring harness to the sole negative of one side of your radio harness. The same for the other side.  Positives will be self explanatory.

Well just skipping ground/antenna/etc wires I have Left Front Positive Right Front Positive Rear Left Negative Rear Right Negative thus far making me think "wire in serial" then Left Common and Right Common So you say I should hook up the wires as appropriate for serial but also treat the commons as negatives and hook them up to the rear negative (speaker) connections as well? I wasn't sure what kind of effect that would have but I'm willing to go for it.

Contact the manufactuer. That does not make sense.

You that reall makes no sense but if it was me and I didnt care if the radio went poof I would hook up the front positive speaker leads to the front positive leads off the deck. I would take the rear positive channels of the rear speakers and hook them up to the rear negative leads off the deck. I would then take the left negative leads off the left speakers and hook them up to the left negative leed off the the deck. then do the same with the right. I dont know if this will work but its the only way common ground decks ever work. I dont know why the rear leads say negative but it cant be right, I dont see any way it can at least. And last its series not seriel wiring. :)double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

What is the make and model number of the stereo?Support the12volt.com

Sounds like a common ground to me. Paul

the common channels actually say "Left Common Speaker" and "Right Common Speaker" Thanks to Ravendarat for the correction, too many hours working at PC repair :p The model is a White-Westinghouse Model No. WW5 came out of another car and donated to me. Don't know what make of car. It says manufactured by Kmart March 1997. I can give a full wire listing if you need it. if noone can think of anything I'll wire it in series and just hope for the best.