Its for a reverse backup camera.
I guess your talking about the dimmer it gets spliced into dash lights after switch.
http://www.modifiedlife.com/car-radio-wiring-diagram-and-car-stereo-wire-diagram-2001-saturn-sc1/ orange and yellow wires are power
Honda fit 2009 Car Radio Battery Constant 12v+ Wire: Pink Car Radio Accessory Switched 12v+ Wire: Orange Car Radio Ground Wire: Black Car Radio Illumination Wire: Gray Car Stereo Dimmer Wire: Red 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 (+): Light Blue Left Front Speaker Negative Wire (-): Light Green Right Front Speaker Positive Wire (+): Brown Right Front Speaker Negative Wire (-): Red Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Gray Left Rear Speaker Negative Wire (-): Brown Right Rear Speaker Positive Wire (+): Blue Right Rear Speaker Negative Wire (-): Orange
1995 Ford Ranger Pickup Truck Car Stereo Wiring Diagram Car Radio Battery Constant 12v+ Wire: Green/Purple Car Radio Accessory Switched 12v+ Wire: Yellow/Black Car Radio Ground Wire: Black/Light Green Car Radio Illumination Wire: Light Blue/Red Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: Blue Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: 6 1/2″ Car Audio Front Speakers Location: Doors Left Front Speaker Positive Wire (+): Orange/Light Green Left Front Speaker Negative Wire (-): Orange/Light Green Right Front Speaker Positive Wire (+): White/Light Green Right Front Speaker Negative Wire (-): Dark Green/Orange Car Audio Rear Speakers Size: 5″ x 7″ Car Audio Rear Speakers Location: Rear Corners Left Rear Speaker Positive Wire (+): Gray/Light Blue Left Rear Speaker Negative Wire (-): Tan/Yellow Right Rear Speaker Positive Wire (+): Orange/Red Right Rear Speaker Negative Wire (-): Brown/Pink
your ground wire for the stereo is connected to the ignition wire of the car
2006 Ford F350 Car Audio Wire Diagram Car Radio Battery Constant 12v+ Wire: Light Green/Violet Car Radio Accessory Switched 12v+ Wire: Pink Car Radio Ground Wire: Black/Light Green Car Radio Illumination Wire: Light Blue/Red Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: N/A 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 (+): Orange/Light Green Left Front Speaker Negative Wire (-): Light Blue/White Right Front Speaker Positive Wire (+): White/Light Green Right Front Speaker Negative Wire (-): Dark Green/Orange Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Gray/Light Blue Left Rear Speaker Negative Wire (-): Tan/Yellow Right Rear Speaker Positive Wire (+): Orange/Red Right Rear Speaker Negative Wire (-): Brown/Pink
the ACC wire from the stereo is connected to constant power (+12V)
The correct GAUGE wire is 28 for a car stereo.
Car Radio Battery Constant 12v+ Wire: Orange Car Radio Accessory Switched 12v+ Wire: Yellow Car Radio Ground Wire: Black Car Radio Illumination Wire: Brown Car Stereo Dimmer Wire: Gray Car Stereo Antenna Trigger Wire: N/A 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: Dash Left Front Speaker Positive Wire (+): Tan Left Front Speaker Negative Wire (-): Gray Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Dark Green Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: Rear Deck Left Rear Speaker Positive Wire (+): Brown Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Dark Blue Right Rear Speaker Negative Wire (-): Light Blue
yes, it is possible
yellow
Car Radio Constant 12v+ Wire: Orange Car Radio Switched 12v+ Wire: Yellow Car Radio Ground Wire: Black Car Radio Illumination Wire: Gray Car Stereo Dimmer Wire: Brown Car Stereo Antenna Trigger: Pink Left Front Speaker Positive Wire (+): Tan Left Front Speaker Negative Wire (-): Gray Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Dark Green Left Rear Speaker Positive Wire (+): Brown Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Dark Blue Right Rear Speaker Negative Wire (-): Light Blue