1991 Mercury Grand Marquis Stereo Wiring Information
Radio Battery Constant 12v+ Wire: Green/Yellow
Radio Accessory Switched 12v+ Wire: Yellow/Black
Radio Ground Wire: Chassis
Radio Illumination Wire: Blue/Red
Stereo Antenna Trigger Wire: Orange/Blue
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange
1991 Mercury Grand Marquis Speaker Sizes
Audio Front Speakers Size: 5 1/4″ Speakers
Audio Rear Speakers Size: 6″ x 9″ Speakers
The following information is currently not available:
Stereo Dimmer Wire
Stereo Amp Trigger Wire
*If you know any of the above or any other missing information please use the comment box below to notify us.