1994 GMC Sierra C1500 Car Radio Wiring Schematic

Whether your an expert GMC Sierra C1500 mobile electronics installer, GMC Sierra C1500 fanatic, or a novice GMC Sierra C1500 enthusiast with a 1994 GMC Sierra C1500, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 1994 GMC Sierra C1500 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 1994 GMC Sierra C1500.

The Modified Life staff has taken all its GMC Sierra C1500 car radio wiring diagrams, GMC Sierra C1500 car audio wiring diagrams, GMC Sierra C1500 car stereo wiring diagrams, GMC Sierra C1500 car radio wiring schematics, GMC Sierra C1500 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 1994 GMC Sierra C1500 part or component.

Feel free to use any GMC Sierra C1500 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 GMC Sierra C1500 wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 1994 GMC Sierra C1500.


If you have any questions pertaining to the audio system in the 1994 GMC Sierra C1500, please feel free to post it at the bottom of this page and either we’ll 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’t 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’ll do our best to find you the diagram or schematic you need for your mobile audio installation.

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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.

1994 GMC Sierra C1500 Car Radio Wiring Schematic

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

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  • Reply Zachary July 26, 2010 at 8:37 am

    I need the wiring diagram for a 1994 GMC suburban radio.

  • Reply ModifiedLife July 29, 2010 at 10:48 pm

    Zachary, ask and you shall receive: 1994 GMC Suburban Car Stereo Wiring Diagram

  • Reply Kevin June 22, 2011 at 10:45 am

    can you tell me where the factory harness for the 1994 GMC Sierra 1500 is for the radio? I have been told that the harness has to be re-routed which I can do if I know where it is to be re-routed from. anyone?

  • Reply Nicholas Willey July 10, 2011 at 1:28 pm

    Ive installed numerous stereo systems in all my vehicles but my 1994 gmc sierra is something i havent encountered before. first problem i have is there are two separate units. In the front middle of the dash is a cassette player and then right to the right of the steering wheel is a second unit used to control the ac and radio and its actually a twp piece set the ac is actually a separate unit with the radio panel stacked over it to look as one…. so my first question i suppose is when installing my new stereo do i have to deal with both of these separate units and if so an explanation of the process would be great. And my second problem is that the wiring for both units appear to be hard wired, granted i actually didnt take the units themselves apart to look inside and see but typically when i remove a factory unit there is simply a wiring harness to remove and i go from there whether i re wire or use a harness. How do i solve this problem and help would be great as id love to avoid paying a professional installer to do it. anyone?

  • Reply david bishop January 9, 2012 at 2:01 pm

    i need to know how to wire my new stereo up 1994 gmc sierra1500 running in to same problem as Nicholas Willey on July 10, 2011. Thank you for any help. d. bishop.

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