What speaker wires are positive on a Chevy Trailblazer?

There's no single answer to which speaker wire is positive on a Chevy Trailblazer. The color coding of speaker wires varies depending on the year, model, and even the specific factory stereo installation. There's no universal standard.

To determine the positive wire, you'll need to:

* Consult your vehicle's wiring diagram: This is the most reliable method. Your owner's manual might have a simplified diagram, or you might need to find a wiring diagram specific to your Trailblazer's year and model online (often available on forums dedicated to Chevy Trailblazers).

* Use a multimeter: This is the safest way to test the wires. Set your multimeter to DC voltage. With the car's radio on, touch one probe to a suspected positive wire and the other to a good ground (like a bare metal part of the chassis). A positive reading indicates a positive wire. Be extremely careful not to short-circuit anything.

* Test with a 12V test light: Similar to the multimeter, but simpler. A test light will illuminate when connected to a positive wire and a ground. Again, use caution.

Warning: Working with car electronics involves risks. Incorrectly connecting wires can damage your stereo, other car systems, or even cause a fire. If you're not comfortable with electrical work, it's best to have a qualified mechanic or car audio installer perform the task.