Updated: 01/22/2024 • Published: 07/10/2008
Question: Where can I find a 1990 GMC S15 Pickup radio wiring diagram? What are the 1990 GMC S15 Pickup radio wiring harness colors?
If you’re looking to change the radio in your 1990 GMC S15 Pickup or troubleshoot why your car radio stopped working, we’re here to help!
Our comprehensive 1990 GMC S15 Pickup radio wiring diagram shows you all the radio wire harness colors, car speaker wiring colors and car speaker sizes. Use our 1990 GMC S15 Pickup head unit pin-out guide to help you with your car radio troubleshooting and installation needs.
In This Guide
1990 GMC S15 Pickup Radio Wiring Diagram
This 1990 GMC S15 Pickup radio wiring chart shows you all the 1990 GMC S15 Pickup 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 |
|---|---|
| Battery Constant Power Wire (12v+) | Orange |
| Accessory Switched Power Wire (12v+) | Yellow |
| Ground Wire | Black |
Use a Wiring Harness  and Dash Kit  for an Easy Install! |
|
| Illumination Wire | Gray |
| Dimmer Wire | Brown |
| Antenna Trigger Wire | Pink |
| Amplifier Turn-On Wire | N/A |
| Amplifier Mute Wire | N/A |
| Amplifier Location | N/A |
| Use an Amp Wiring Harness to Connect Your OEM Amplifier to an aftermarket radio. |
|
1990 GMC S15 Pickup Speaker Wiring Guide
This 1990 GMC S15 Pickup speaker wiring chart shows you every speaker wire color and the speaker wire location. Use this 1990 GMC S15 Pickup 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 |
|---|---|
| Dash Center Speaker Positive Wire (+) | N/A |
| Dash Center Speaker Negative Wire (-) | N/A |
| 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 |
| 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 |
| Use a Speaker Wire Harness for Easy Speaker Wiring! |
|
| 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 |
| Upgrade your Tweeters for cleaner audio highs! | |
| Rear Left Speaker Positive Wire (+) | Brown |
| Rear Left Speaker Negative Wire (-) | Yellow |
| Rear Right Speaker Positive Wire (+) | Dark Blue |
| Rear Right Speaker Negative Wire (-) | Light Blue |
| Upgrade your Subwoofer for deeper and cleaner bass! | |
| Left Subwoofer Positive Wire (+) | N/A |
| Left Subwoofer Negative Wire (-) | N/A |
| Right Subwoofer Positive Wire (+) | N/A |
| Right Subwoofer Negative Wire (-) | N/A |
1990 GMC S15 Pickup Speaker Sizes and Location
This 1990 GMC S15 Pickup speaker size chart shows your speaker measurements and speaker locations. Use this chart to see what speaker fits in your 1990 GMC S15 Pickup.
| Application | Speaker Size and Location |
|---|---|
| Dash Center Speaker Size | N/A |
| Dash Center Speaker Depth | N/A |
| Dash Center Speaker Location | N/A |
| Upgrade your Center Speakers for awesome sound! | |
| Front Tweeter Size | N/A |
| Front Tweeter Depth | N/A |
| Front Tweeter Location | N/A |
| Upgrade your Tweeters for cleaner audio highs! | |
| Front Speaker Size | 4″ x 6″ Speakers |
| Front Speaker Depth | 2.2″ Depth |
| Front Speaker Location | Front Doors |
| Use a Speaker Wire Harness for Easy Speaker Wiring! |
|
| Rear Tweeter Size | N/A |
| Rear Tweeter Depth | N/A |
| Rear Tweeter Location | N/A |
| Use a Speaker Wire Harness for Easy Speaker Wiring! |
|
| Rear Speaker Size | 4″ x 10″ Speakers |
| Rear Speaker Depth | 3″ Depth |
| Rear Speaker Location | Rear Corners |
| Upgrade your Subwoofer for deeper and cleaner bass! | |
| Subwoofer Size | N/A |
| Subwoofer Depth | N/A |
| Subwoofer Location | N/A |
Questions and Answers
If you have any questions about your 1990 GMC S15 Pickup 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!
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