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OK, here's the problem: Some of the 86's have the fader (F/R) control mounted on the control panel, next to the A/C switch, lighter, etc. The problem with this fader is that it is a 'common-ground' type, meaning one ground wire for both L and R output. While this will work for a low-power common ground amplifier, most modern equipment (your typical 15wX4 CD Receiver) will require isolated grounds for each speaker, front and rear.
Look behind the control panel for a pair of black wires, + marked with yellow stripes. These would be the back speaker wires, if they exist.
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