I recently bought a 2003 K1500 Silverado with an aftermarket double din Pioneer radio that “isn’t hooked up” (seller’s words) What he failed to mention was the fact that the wiring harness was cut on the truck side of the connector plug so I want to hard wire the pioneer. The factory radio was one with the Bose system. I have found countless radio wiring diagrams for this yr/make/model none of which have proved helpful because; 1,the colors don’t match what I have and 2, reading them is not one of my stronger skill sets. I’m hoping someone can dumb it down and tell me which color goes to what.

These are the only 2 colors I have figured out: Thick orange wire: is my 12v constant and the Black & white one is Ground.

The rest are as follows:

Black,
Purple
Dk green
Pink
Dk blue
Lt green
Tan
Green & white
Brown
Thin orange
Gray
Orange & black
None of these are paired(twisted together) to indicate they’re speaker wires.
There are also bare wire strands that are drain wires (I’m sure they don’t hook to anything) I know the harness has no switched wire and I’ll have to run one to the ignition or the fuse box.
The solution possibly lies in the RPO codes in the glovebox but they are greek to me (even with the 412 page look up list)
These are the wires in my radio harness.
Any help/guidance would be greatly appreciated!

 

get some schematics on crutchfield.com or charm.li

 

If replacing the plug on the harness on the truck side will help, go to the junkyard and get the end of the harness from a 03 with matching colors and splice it in. The colors for the radio are usually standardized.
Yellow --12v memory
Red --12V switch
Orange --Dash light
Blue --Power antenna
White -- Left Front Speaker +
White/Blk- Left Front Speaker -
Green -- Left Front Speaker +
Green/Blk- Left Front Speaker -
Gray -- Left Front Speaker +
Gray/Blk- Left Front Speaker -
Violet -- Left Front Speaker +
Violet/Blk- Left Front Speaker -