1. Gather Your Tools and Materials:
* New Stereo: Obviously! Make sure you have the correct mounting kit (often a double-DIN or single-DIN dash kit depending on your stereo size and the truck's existing dash). These kits adapt the stereo to fit the dash opening.
* Wiring Harness: A wiring harness adapter is crucial. This connects your new stereo's wiring to the factory wiring in your truck. Getting the correct one for your year and model is essential – wrong connections can damage your stereo or truck's electrical system.
* Installation Kit (optional but recommended): This usually includes the dash kit, mounting brackets, screws, and sometimes wire ties.
* Screwdrivers: Phillips and flathead, various sizes.
* Wire Strippers/Cutters: For cutting and preparing wires if needed.
* Crimp Connectors: To securely connect wires. Soldering is preferred but more advanced.
* Test Light or Multimeter (optional but helpful): To check power and ground connections.
* Wire Ties or Zip Ties: To keep wiring neat and organized.
* Safety Glasses: Protect your eyes.
2. Remove the Old Stereo:
* Remove the faceplate: There are usually screws hidden behind the faceplate of the old stereo. Remove these screws. The faceplate should then slide out or pull out.
* Remove the stereo itself: You'll likely see mounting screws holding the stereo unit in place. Remove these screws. The stereo should then slide out of the dash.
3. Install the Dash Kit (if needed):
* Your new stereo might require a dash kit. This kit fills the gap between the stereo and the dash.
* Follow the instructions provided with the dash kit. Generally, this involves attaching the kit to the dash opening, and the stereo will then mount to the kit.
4. Connect the Wiring Harness:
* This is the most critical step: Incorrect wiring can damage your stereo or vehicle. Refer to the wiring diagrams for both your new stereo and the wiring harness adapter. The adapter usually provides color-coded wires that correspond to your stereo's wiring.
* Common wire colors and functions:
* Constant 12V (+): Provides power to the stereo even when the ignition is off (usually red or yellow wire).
* Switched 12V (+): Powers the stereo when the ignition is on (usually red or yellow with a stripe).
* Ground (-): Connects the stereo to the vehicle's ground (usually black).
* Illumination (+): Powers the stereo's lights (usually blue or orange).
* Speaker wires: Connect to your speakers (usually various colors). Pay close attention to the positive (+) and negative (-) wires for each speaker. Incorrect polarity will result in poor sound or damaged speakers.
* Antenna wire: Connects to your vehicle's antenna (usually blue).
* Remote wire: Turns on the amplifier (if applicable).
* Carefully connect each wire from the harness to the corresponding wire on the stereo. Use crimp connectors or soldering to make secure connections.
5. Install the New Stereo:
* Slide the stereo into the dash kit or opening.
* Secure the stereo with the provided screws.
6. Reconnect the Battery and Test:
* Carefully reconnect the negative battery terminal.
* Turn on the ignition and test your new stereo. Make sure everything is working correctly – sound from all speakers, correct lighting, etc.
7. Put Everything Back Together:
* Replace any trim pieces or panels that you removed during the installation process.
Important Considerations:
* Consult a wiring diagram: Find a wiring diagram specifically for your 1990 Chevy Silverado. This will help you identify the correct wires and avoid mistakes. Online resources like forums dedicated to Chevy Silverados can be helpful.
* Professional installation: If you're not comfortable with car audio installation, consider taking your truck to a professional. Improper wiring can lead to significant damage.
* Antenna adapter: You may need an antenna adapter to connect your new stereo to the factory antenna.
This guide provides a general overview. The specific steps may vary slightly depending on the stereo and the condition of your truck's dash. Always refer to the instructions provided with your stereo and any installation kits. Take your time, be methodical, and double-check your connections before powering on the stereo.
