I can't get any sound out of my rear speakers in my 2000 oldsmobile alero.Its got good power runing through the wires bc i hooked up another speaker and my factory speakers are good but no sound

SOURCE: installing aftermarket speakers on a 2000 trans am

At the parts store or Radio Shack or the Marts or even a good dollar store they sell slip on connectors that have different color ends, see what size you need and let her crimp them on and finish the job..Just watch her have while having a cold one..

SOURCE: 1998 Audi A4 Quattro rear speaker wiring

You can't use any of those - the large connector at the OEM speakers is because the rears are amplified. Your factory head unit puts out a line level signal to the rear speakers. There's an amplifier on the driver's side rear speaker (the box around the magnet that you can see from inside the trunk).

You need to either replace the head unit with an aftermarket one to drive your new speakers, or you need to tap into the amp connector and find the line level wires, break them out, put RCA plugs onto them, and plug them into an aftermarket amp, which you'd use to power your rear speakers. Doing it that way allows you to keep the factory head unit.

SOURCE: needing wiring diagram for 1991 dodge dynasty le

here is what I found:
http://www.the12volt.com/installbay/stereodetail/715.html

SOURCE: factory speakers sizes

If you go onto the Crutchfield .com web site and click on their link - "outfit my car" it will list your factory speakers. The site will ask for info regarding your particular vehicle: 2 door, 4 door, with bose system, etc. The speaker sizes may be the same for all options. You can find out by clicking on all the options to compare.

SOURCE: radio harness diagram for 95 chevy tahoe....rear

check wiring on passengers side near the rear hatch speaker, the rear door speakers are run through them also. i had the same problem and it was a unplugged connector at that location