Please help. This is not my frist car stereo install, but I am thoroughly confused. It has no wires for the speakers ie front left front right so on and so forth. It only has rca plugs for front channel and rear . Is there an adapter for cars that dont use rca style plugs? One install place told me to use a set of rca plugs and plug them into the unit then splce the other ends. Ony thing is how do I know + from - ? Left from right?

Please help

Did you buy this unit used or new? It has a harness for hooking up the door speakers that has speaker wires on it. It's the harness with the black plug in on it.

what year make and model is your car? some cars that have premium sound systems (factory amp) use RCA plugs to send the signal into the amp

Just read the post again, are you talking about the car or the radio?