Whether your an expert Mercury Grand Marquis mobile electronics installer, Mercury Grand Marquis fanatic, or a novice Mercury Grand Marquis enthusiast with a 2003 Mercury Grand Marquis, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2003 Mercury Grand Marquis vehicles are becoming increasing more difficult to identify due to the installation of more advanced factory oem electronics.

One of the most time consuming tasks with installing an after market car stereo, car radio, satellite radio, xm radio, car speakers, tweeters, car subwoofer, crossovers, audio equalizer, car amplifier, mobile amp, car amplifier, mp3 player, ipod or any car audio electronics is identifying the correct color car audio wires for your 2003 Mercury Grand Marquis.

The Modified Life staff has taken all its Mercury Grand Marquis car radio wiring diagrams, Mercury Grand Marquis car audio wiring diagrams, Mercury Grand Marquis car stereo wiring diagrams, Mercury Grand Marquis car radio wiring schematics, Mercury Grand Marquis car wiring diagrams and cataloged them online for use by our visitors for free. Our automotive wiring diagrams allow you to enjoy your new mobile electronics rather than spend countless hours trying to figure out which wires goes to which 2003 Mercury Grand Marquis part or component.

Feel free to use any Mercury Grand Marquis car stereo wiring diagram that is listed on Modified Life but keep in mind that all information here is provided “as is” without any warranty of any kind and most of the car audio wiring diagrams listed on our enthusiast website are submitted by the Modified Life community. Use of the Mercury Grand Marquis wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 2003 Mercury Grand Marquis.

Questions

If you have any questions pertaining to the audio system in the 2003 Mercury Grand Marquis, please feel free to post it at the bottom of this page and either we will do our best to find you the information you need or hopefully someone in the Modified Life community will have the information you’re looking for.

Request a Car Stereo Wiring Diagram

If you can not find a particular car audio wire diagram on Modified Life, please feel free to post a car radio wiring diagram request at the bottom of this page and we will do our best to find you the diagram or schematic you need for your mobile audio installation.

Adding More Information

If you would like to help the Modified Life community by adding any missing information or adding a new car audio wire diagram to our resource, please feel free to post it at the bottom of this page.

2003 Mercury Grand Marquis Car Audio Wiring Information

Car Radio Battery Constant 12v+ Wire: Violet/Light Blue
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Light Blue/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: Blue
Car Stereo Amplifier Location: Under the rear deck in the trunk.
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Orange/Light Green
Left Front Speaker Negative Wire (-): Light Blue/White
Right Front Speaker Positive Wire (+): White/Light Green
Right Front Speaker Negative Wire (-): Dark Green/Orange
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Tan/Yellow
Left Rear Speaker Negative Wire (-): Gray/Blue
Right Rear Speaker Positive Wire (+): Brown/Pink
Right Rear Speaker Negative Wire (-): Orange/Red

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Make Your Car Audio Installation Easy with these Tools and Accessories