Color codes i'm installing a four channel amp into my car but i can't figure out the color codes for my front and back speakers (negative and possitive wires).

Here is what I show from the manual.
2005 Hummer H2 Car Audio Installation Guide
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Ground Wire: Black/White
Car Stereo Antenna Trigger Wire: Gray
Car Stereo Amp Trigger Wire: Pink
Car Stereo Amplifier Location: Under the Center Console or Behind the Glove Box
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

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

http://www.the12volt.com/installbay/stereodetail/347.html

Should be it.

2003 Nissan Frontier Truck Car Radio Stereo Audio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Pink
Car Radio Accessory Switched 12v+ Wire: Blue
Car Radio Ground Wire: Gray or Chassis
Car Radio Illumination Wire: Red/Blue
Car Stereo Dimmer Wire: Red/Yellow
Car Stereo Antenna Trigger: 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 (+): Pink
Left Front Speaker Negative Wire (-): Blue
Right Front Speaker Positive Wire (+): White
Right Front Speaker Negative Wire (-): Black
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Light Green
Left Rear Speaker Negative Wire (-): Violet
Right Rear Speaker Positive Wire (+): Blue
Right Rear Speaker Negative Wire (-): Pink

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

2000 Ford Expedition Car Radio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: White/Purple
Car Radio Accessory Switched 12v+ Wire: Black/Pink
Car Radio Ground Wire: Black/Green
Car Radio Illumination Wire: Blue/Black
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′ x 8′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): White/Red
Left Front Speaker Negative Wire (-): Brown
Right Front Speaker Positive Wire (+): Green
Right Front Speaker Negative Wire (-): White/Orange
Car Audio Rear Speakers Size: 6′ x 8′
Car Audio Rear Speakers Location: Rear Doors
Left Rear Speaker Positive Wire (+): Light Blue/Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Purple/White
Right Rear Speaker Negative Wire (-): Light Blue

1992 Cadillac Eldorado Car Radio Wiring Schematic
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5 1/4′
Car Audio Front Speakers Location: Doors
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: 6′ x 9′
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

Here ya go. enjoy!
2002 GMC Sierra C1500 Car Radio Wire Color Codes
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black/White
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: Under the center console.
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
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: N/A
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

Hello latinoheatj5,

According to modified life.com the speaker wire colors for the 2008 Aspen are:

Left Front Speaker Positive Wire (+): Dark Green
Left Front Speaker Negative Wire (-): Brown/Red
Right Front Speaker Positive Wire (+): Brown/Yellow
Right Front Speaker Negative Wire (-): Brown/Light Blue
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): White
Left Rear Speaker Negative Wire (-): Dark Blue/Red
Right Rear Speaker Positive Wire (+): Brown/White
Right Rear Speaker Negative Wire (-): Brown/Orange

You can go to their web site here for other radio wiring color codes.
http://www.modifiedlife.com/2008-chrysler-aspen-car-stereo-wiring-diagram/