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2003 GMC Sierra 1500 Radio Wiring Guide


Question: Where can I find a 2003 GMC Sierra 1500 radio wiring diagram? What are the 2003 GMC Sierra 1500 radio wiring harness colors?

If you’re looking to change the radio in your 2003 GMC Sierra 1500 or troubleshoot why your car radio stopped working, we’re here to help!

Our comprehensive 2003 GMC Sierra 1500 radio wiring diagram shows you all the radio wire harness colors, car speaker wiring colors and car speaker sizes. Use our 2003 GMC Sierra 1500 stereo wiring guide to help you with your car radio and installation needs.

2003 GMC Sierra 1500 Radio Wiring Diagram

This 2003 GMC Sierra 1500 radio wiring chart shows you all the 2003 GMC Sierra 1500 radio wire colors and their functions. Utilize this guide to help you with a car radio install or help with a car radio troubleshoot. If you don’t see the car radio wiring information you’re looking for, please feel free to ask your question at the bottom of this page.

Application Radio Wire Color
Car Radio Battery Wire (Constant Power 12v+) Orange
Car Radio Accessory Wire (Switched Power 12v+) The radio harness does not provide a switched power source. Run a wire to the fuse box or ignition switch harness for switched power.
Car Radio Ground Wire Black/White
arrow Use a Car Radio Wiring Harness and Car Radio Dash Kit for an Easy Install!
Car Radio Illumination Wire Brown
Car Stereo Dimmer Wire Gray
Car Radio Antenna Trigger Wire N/A
Car Radio Amp Turn-On Trigger Wire N/A
Car Radio Amp Mute Wire N/A
Car Radio Amplifier Location N/A
arrow Use an Amp Integration Harness to Connect Your Factory Amplifier to an aftermarket radio.

2003 GMC Sierra 1500 Speaker Wiring Guide

This 2003 GMC Sierra 1500 speaker wiring chart shows you every speaker wire color and the speaker wire location. Use this 2003 GMC Sierra 1500 speaker wiring guide to help you with a speaker replacement or speaker upgrade. If the car speaker wiring information you’re searching for is not listed, please don’t hesitate to ask for it at the bottom of this page.

Application Speaker Wire Color
Front Center Speaker Positive Wire (+) N/A
Front Center Speaker Negative Wire (-) N/A
arrow Upgrade your Center Speakers for awesome sound!
Front Left Tweeter Positive Wire (+) N/A
Front Left Tweeter Negative Wire (-) N/A
Front Right Tweeter Positive Wire (+) N/A
Front Right Tweeter Negative Wire (-) N/A
arrow Upgrade your Tweeters for cleaner audio highs!
Front Left Speaker Positive Wire (+) Tan
Front Left Speaker Negative Wire (-) Gray
Front Right Speaker Positive Wire (+) Light Green
Front Right Speaker Negative Wire (-) Dark Green
arrow Use a Speaker Wire Harness for easy Speaker Installation!
Rear Left Tweeter Positive Wire (+) N/A
Rear Left Tweeter Negative Wire (-) N/A
Rear Right Tweeter Positive Wire (+) N/A
Rear Right Tweeter Negative Wire (-) N/A
arrow Upgrade your Tweeters for cleaner audio highs!
Rear Left Speaker Positive Wire (+) White/Green
Rear Left Speaker Negative Wire (-) Gray/White
Rear Right Speaker Positive Wire (+) White
Rear Right Speaker Negative Wire (-) Gray
arrow Upgrade your Subwoofer for deeper lows!
Left Subwoofer Positive Wire (+) N/A
Left Subwoofer Negative Wire (-) N/A
Right Subwoofer Positive Wire (+) N/A
Right Subwoofer Negative Wire (-) N/A

2003 GMC Sierra 1500 Speaker Sizes and Location

This 2003 GMC Sierra 1500 speaker size chart shows your speaker measurements and speaker locations. Use this chart to see what speaker fits in your 2003 GMC Sierra 1500.

Application Speaker Size and Location
Front Center Speaker Size N/A
Front Center Speaker Depth N/A
Front Center Speaker Location N/A
arrow Upgrade your Center Speakers for awesome sound!
Front Tweeter Size N/A
Front Tweeter Depth N/A
Front Tweeter Location N/A
arrow Upgrade your Tweeters for cleaner audio highs!
Front Speaker Size 6.5″ Speakers
Front Speaker Depth 3.25″ Depth
Front Speaker Location Front Doors
arrow Use a Speaker Wire Harness for easy Speaker Installation!
Rear Tweeter Size N/A
Rear Tweeter Depth N/A
Rear Tweeter Location N/A
arrow Use a Speaker Wire Harness for easy Speaker Installation!
Rear Speaker Size 6.5″ Speakers
Rear Speaker Depth 3.3″ Depth
Rear Speaker Location N/A
arrow Upgrade your Subwoofer for deeper lows!
Car Subwoofer Speaker Size N/A
Car Subwoofer Speaker Depth N/A
Car Subwoofer Speaker Location N/A

Questions and Answers

If you have any questions about your 2003 GMC Sierra 1500 radio installation, please don’t hesitate to post them at the bottom of this page. We’re committed to finding the answers you need, and members of the Modified Life community may also provide valuable insights into the car stereo information you’re looking for. Don’t hesitate to ask your car audio question; it could benefit others seeking the same answers!

Contribute

Do you want to contribute 2003 GMC Sierra 1500 stereo wire diagram information to benefit the Modified Life community? Feel free to share your insights by posting at the bottom of this page. We will gather any additional information presented below by our community, verify it, and incorporate it into the car radio wiring guide above for easy reference. We are consistently adding new information to improve and update this car stereo wiring guide as it becomes available. We appreciate your contribution in advance!

5 thoughts on “2003 GMC Sierra 1500 Radio Wiring Guide”

  1. I am having the same issue. I tested the front leads from the stereo by hooking them to the rear speakers and they work, so the problem is not my stereo and I checked every fuze and all were good.

  2. i have a 2003 gmc sierra c1500 truck and my front speakers are not working. once or twice i heard them on but only temporarily. rear are working fine! any sugestions on how to fix this? thanks doug

  3. You have a FANTASTIC website. Easy to use and very good information. I commend you for your commitment to FREE information, when everyone else is charging for it. I WILL use your website again and share the information with my friends and family. A+

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