In this situation 8 times out of 10 the problem is not with the radio, it's that there are factory amplifiers. Many cars have them, and most require a little work, or an adapter to get going. Tell me the year, make, and model of the car, and perhaps I can give you more info.
Well if you have sound to the front, and not the rear, you may have some blown speakers.. The best way to test a speaker is with a multimeter.. Just set the multimeter to the "upside down horse shoe" (Ohms reading) and touch the leads directly to the speaker terminals. You should get a reading of around 4, or maybe 2 if it's amplified. if you get no reading, or a reading that is way off, your speakers are blown.
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96 Oldsmobile cutlass supreme, front speakers work now but the back speakers don't.I also have an amp hooked up as well...
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