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Yes I was asking if your car was using common ground, the wire diagram did not indicate this. Probably was something like the Chrysler K car that used that to save $1 in wire.
Is there any built in resistance in those speaker terminals? One thing you should check is the impedance of your speakers, usually 4 ohm for modern auto, but when joining them in parallel like those adaptors do the result will be 2 ohm. Your amplifier needs to be rated for that, or can run hot and eventually let the magic smoke out. There is a good chance that that factory fader has some internal resistance built in.
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87 930,
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