Answer
1986-89 mercury sable stereo information
constant 12v+ green/yellow
switched 12v+ yellow/black
ground red or black
illumination blue/red
dimmer n/a
antenna trigger orange/blue
antenna right front
front speakers 3 1/2" dash
left front (+) orange/green
left front (-) blue/white
right front (+) white/green
right front (-) green/red
rear speakers 5" x 7" rear deck
left rear (+) pink/green
left rear (-) blue/orange
right rear (+) pink/blue
right rear (-) brown/red