Its for a reverse backup camera.
The reverse wire in a car stereo system is typically used to trigger specific functions when the vehicle is in reverse gear, such as activating a rear-view camera or enabling parking assist features. This wire is usually connected to the vehicle's reverse light circuit and signals the stereo to switch to the appropriate input or display. Properly connecting this wire can enhance the functionality of the stereo and improve safety while reversing.
your ground wire for the stereo is connected to the ignition wire of the car
the ACC wire from the stereo is connected to constant power (+12V)
The correct GAUGE wire is 28 for a car stereo.
yellow
yes, it is possible
The illumination wire on a car stereo is meant for the brightness on the display. It is used to adjust the brightness of the display for seeing it during night hours.
the black wire or yellow wire are not connected right
Nothing.
red
Car Radio Battery Constant 12v+ Wire: Blue/White Car Radio Accessory Switched 12v+ Wire: Gray Car Radio Ground Wire: Brown Car Radio Illumination Wire: Green Car Stereo Dimmer Wire: White/Black Car Stereo Antenna Trigger Wire: Black Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Pink Left Front Speaker Negative Wire (-): Violet Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Blue Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Black Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Red Right Rear Speaker Negative Wire (-): White