Need to know stero wiring color codes for 1987 corvette bose system

Partial wiring diagrams are usually available, but if you want a full wiring schematic, you need a workshop manual or a subscription to a website.

https://www.justanswer.com/chevy/2iqt1-color-code-ignition-module-1988-chev-s10.html

https://www.google.com/search?q=1987+Chevy+S10+2.8+spark+module+color+code+wiring+diagram

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I'd suggest you to get a wiring diagram for your specific make and model of car, as the wire colors and connections can vary depending on the car and the type of audio system it has. The best place to find a wiring diagram for your 2003 Trailblazer would be a factory service manual or a Haynes manual. These manuals are available for purchase online or at an auto parts store.
If you have already cut the harness and if you don't have the wiring diagram or manual then it could be challenging to determine the functions of each wire. In such a scenario you could use a multimeter to measure the resistance of each wire, then identify which wires are which based on the component they go to. If the wiring is cut, you can also try matching the wire colors with the wiring diagram and connecting them accordingly.
In case you do not have the manual, you can also try searching online for wiring diagrams. However, be aware that not all diagrams found online will be accurate, so it's best to use diagrams from a reputable source. Also be aware that working on car wiring can be dangerous and it's important to take the proper precautions to avoid electric shock or damage to the vehicle.

Boss or Bose?

It's telling you that the red wire is number 5 wire on the wiring diagram or the number 8 wire in the harness is white.

None are actually color coded. The schematic has the wire colors on it next to the wire.

As in aftermarket like a Sony or Kenwood or..???? Yes.
The easiest way to install one is to get an installation kit. One that has a bracket/face that fills the hole in the dash and the new radio sits in and a wire harness. The harness makes things so simple. You don't need to know what wire color is what. The cars factory harness plugs right in and the new radio wires will be the same color on the harness.

RECHECK THE WIRING TO SPEAKERS AND CHECK THE STERO IS COMPATIBLE TO WIRING.

buy hanes book on it for you year make model of car

http://www.modifiedlife.com/2000-ford-focus-car-radio-wire-color-codes/

there is a code for color!? ok, wait im searching...
found it! here you go, hope it helps...

Wiring color codes are the identification colors that color the wires in your automobile. For example, if you have a British car the blue, blue and white , and blue and red wires are for the headlights. The red and white wires are for the instrument lights, and the green and white and green and red wires are for the turn lights. The color code simply identifies what that wire does. Could you imagine if all of the wires were the same color. You couldn't identify anything in a harness.