The rear speakers in my 1999 Taurus wagon do not work. I thought it might be my receiver, but I bought a second one to test the fader from E-BAY and performed the same (Fronts work, rears do not.) It is the climate control receiver, not the manual. This is a wagon. Help please.

If you have a multimeter you cab perform the following tests:

Disconnect the cables to the speaker terminals. Using the OHMS function, probe the two speaker terminals with the meter. If the speaker is working you should hear a thumping sound when the meter is connected/disconnected from the terminals. No thumping sound means an open speaker voice coil.

If you hear the thumping sound that means the amp may not be working. I do not have a 99 wiring diagram (my book is for 96-98) but I believe the actual radio/amp is still somewhere in the rear of the wagon, not in the front control head that you swapped out. If you swapped out only the front then the radio/amp is the most likely culprit. I doubt that the wiring harness would have a separate connector only for the rear speakers that could have worked loose.