The factory microphones (in most automobiles) these day have a different impedence (and are sometimes amplified as well) than do aftermarket microphones.“From what i can tell, the mics are fairly basic and just require + and -, and since there are two there are two positive and two negative wires.”
SO, I finally got around to trying this and I did not get it to work. Anyone have any success???
The best most people can do would be to run the mic that came with the aftermarket stereo up to where the factory mic is.