Determine positive and negative wires in backup bulb wires

1999 Mercury Cougar Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Orange/Black
Car Radio Accessory Switched 12v+ Wire: Yellow/Green
Car Radio Ground Wire: Black/Green
Car Stereo Dimmer Wire: White/Green
Left Front Speaker Positive Wire (+): White/Black
Left Front Speaker Negative Wire (-): Gray/Black
Right Front Speaker Positive Wire (+): White/Red
Right Front Speaker Negative Wire (-): Gray/Red
Car Audio Rear Speakers Location: Side Panels
Left Rear Speaker Positive Wire (+): White/Purple
Left Rear Speaker Negative Wire (-): Gray/White
Right Rear Speaker Positive Wire (+): White
Right Rear Speaker Negative Wire (-): Gray

1999 Mercury Cougar Car Stereo Wiring Diagram ModifiedLife com

Try this one.
Car Radio Battery Constant 12v+ Wire: Light Violet
Car Radio Accessory Switched 12v+ Wire: Green
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Light Blue/White
Car Stereo Dimmer Wire: N/A
Left Front Speaker Positive Wire (+): White/Green
Left Front Speaker Negative Wire (-): White/Black
Right Front Speaker Positive Wire (+): Yellow/White
Right Front Speaker Negative Wire (-): Yellow/Red
Left Rear Speaker Positive Wire (+): Brown/Black
Left Rear Speaker Negative Wire (-): Brown/Green
Right Rear Speaker Positive Wire (+): Light Green/Yellow
Right Rear Speaker Negative Wire (-): Orange/Black

1995 Ford F150 Truck Car Radio Wiring Diagram

Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Red or Black
Car Radio Illumination Wire: Blue/Red
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Oran

2002 Chrysler Sebring Car Radio Installation Instructions
Car Radio Battery Constant 12v+ Wire: Orange/Black
Car Radio Accessory Switched 12v+ Wire: White/Green
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Green/White
Car Stereo Dimmer Wire: Black/Green
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 (+): White/Blue
Left Front Speaker Negative Wire (-): Black/Blue
Right Front Speaker Positive Wire (+): Violet
Right Front Speaker Negative Wire (-): Blue/Red
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown/Yellow
Left Rear Speaker Negative Wire (-): Brown/Light Blue
Right Rear Speaker Positive Wire (+): Blue/White
Right Rear Speaker Negative Wire (-): Blue/Orange
24 7 Locksmith Tonawanda NY 716 200 1030 Emergency Locksmith

hope this helps
Radio Battery Constant 12v+ Wire: Green/Yellow
Radio Accessory Switched 12v+ Wire: Yellow/Black
Radio Ground Wire: Black/Light Green
Radio Illumination Wire: Blue/Red
Stereo Antenna Trigger Wire: Orange/Blue
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange

Following are color codes of stock stereo wirings for your Chrysler 300 - you should compare the diagrams with your car and use the one which seems right for you:
1st Diagram
• Car Radio Battery Constant 12v+ Wire: Pink
• Car Radio Accessory Switched 12v+ Wire: Blue
• Car Radio Ground Wire: Gray
• Car Radio Illumination Wire: Red/Blue
• Car Stereo Dimmer Wire: Red/Yellow
• 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: 6 1/2?
• Car Audio Front Speakers Location: Doors
• Left Front Speaker Positive Wire (+): Pink
• Left Front Speaker Negative Wire (-): Blue
• Right Front Speaker Positive Wire (+): White
• Right Front Speaker Negative Wire (-): Black
• Car Audio Back Speakers Size: 6? x 9?
• Car Audio Back Speakers Location: Side Panels
• Left Back Speaker Positive Wire (+): Light Green
• Left Back Speaker Negative Wire (-): Purple
• Right Back Speaker Positive Wire (+): Blue
• Right Back Speaker Negative Wire (-): Pink

2.
• Car Radio Battery Constant 12v+ Wire: Yellow
• Car Radio Accessory Switched 12v+ Wire: Green/Black
• Car Radio Ground Wire: Chassis
• Car Radio Illumination Wire: Red
• Car Stereo Dimmer Wire: Gray
• Car Stereo Antenna Trigger Wire: N/A
• Car Stereo Amp Trigger Wire: Green/White
• Car Stereo Amplifier Location: Under the Passenger Front Seat.
• Car Audio Front Speakers Size: N/A
• Car Audio Front Speakers Location: N/A
• Left Front Speaker Positive Wire (+): White
• Left Front Speaker Negative Wire (-): Black
• Right Front Speaker Positive Wire (+): Yellow
• Right Front Speaker Negative Wire (-): Brown
• Car Audio Back Speakers Size: N/A
• Car Audio Back Speakers Location: N/A
• Left Back Speaker Positive Wire (+): Brown
• Left Back Speaker Negative Wire (-): Black/Red
• Right Back Speaker Positive Wire (+): Blue
• Right Back Speaker Negative Wire (-): Black/White

connect the wires as indicated below

1999 Chevrolet Silverado C1500 Wiring, aftermarket stereo wire colors

Car Radio Battery Constant 12v+ Wire: Orange, yellow
Car Radio Accessory Switched 12v+ Wire: Yellow, red
Car Radio Ground Wire: Black, black
Car Radio Illumination Wire: Gray (Tape off) not used
Car Stereo Dimmer Wire: Brown (Tape off) not used
Left Front Speaker Positive Wire (+): Tan, white
Left Front Speaker Negative Wire (-): Gray, white/black
Right Front Speaker Positive Wire (+): Light Green, gray
Right Front Speaker Negative Wire (-): Dark Green, gray/black
Left Rear Speaker Positive Wire (+): Brown, green
Left Rear Speaker Negative Wire (-): Yellow, green/black
Right Rear Speaker Positive Wire (+): Dark Blue, purple
Right Rear Speaker Negative Wire (-): Light Blue, purple/black

1992 Ford F150 Truck Car Stereo Wire Diagram
Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Red or Black
Car Radio Illumination Wire: Blue/Red
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange

2003 Kia Spectra Car Stereo Wiring Color Codes
Car Radio Battery Constant 12v+ Wire: Pink
Car Radio Accessory Switched 12v+ Wire: Green
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Red/Black
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 (+): White/Green
Left Front Speaker Negative Wire (-): White/Brown
Right Front Speaker Positive Wire (+): Yellow/White
Right Front Speaker Negative Wire (-): Yellow/Red
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown/Black
Left Rear Speaker Negative Wire (-): Brown/Green
Right Rear Speaker Positive Wire (+): Light Green/Yellow
Right Rear Speaker Negative Wire (-): Ornage/Black

1994 Ford Tempo Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Red or Black
Car Radio Illumination Wire: N/A
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: 6 1/2′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Car Audio Rear Speakers Size: 5′ x 7′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange