What does orange wire go to?

Red or orange wires are often used to provide the secondary phase voltage in a 220-volt application. Always assume that a red or orange wire (in addition to the black wire, which provides the primary phase voltage) is live.

Where do I connect the orange wire on a car stereo?

You can connect the head unit’s orange/white wire to the adapter harness orange wire and it should work fine.

Can I connect illumination wire to 12v?

The point of the illumination wire is to dim the brightness of the headunit when it senses that you’ve turned the headlights on. If you connect to either a 12v constant or 12v switched wire it will always be dim. You could put a switch in to manually dim it or tap the headlight switch if you wanted.

What is the illumination wire for in a car?

In short, the illumination wire on a car stereo wiring harness is used to dim the screen on your aftermarket car stereo. The wire is connected directly to your instrument cluster and provides a negative trigger or positive trigger that tells your radio when you turn on and off your headlights.