ok, i do have an older aftermarket unit in my truck that i have used in my past trucks. for some reason, my rear speakers are not working though. checked the wiring on the wiring harness, and adjusted the settings on the unit, but still nothin in the rear. front speakers work great, but i cant figure this one out. help please

Adapter harness (Metra, Schose, ect)? Aftermarket speakers? Run your own speaker wiring? Not enough info to go on.
John

the only thing aftermarket is the harness. schose or however you spell it. my bro even helped me the other night and we went back and redid all the connections on it. factory speakers, factory wiring, etc. just pioneer head unit.

Are you sure the rear outputs worked prior to install? Pioneer is the only audio company that does not use the industry standard wiring color codes, so double check the speaker wiring (I'm sure you did). Try wiring a small speaker straight to the radio to check rear output output.
John