Im installing a JVC KD - A315 radio in a 2003 alero, when i took out old radio all the wires were cut and turned into speaker wire running all over the place the factory amp is in the back i went ahead and put all the wires back to factory state, however after hooking up the wires i have 2 exstra purple wires a gray small black and dark green wires left over, ill list the wires connected to what in the radio here left is car right is JVC Radio Constant 12v+ wire: Orange -- Radio : Yellow Ground: Black on both Left front: Tan and Gray -- Radio white and white with black strip Right Front: light and dark green ---- Radio gray and gray with black strip Rear Left : Brown and yellow --- Radio: Green and green with black strip Right Rear: blue and light blue Radio: purple and purple with black strip Radio Ignition: ? Radio: Red i believe i can red the run off the fuse box, however i still have 6 wires that i dont know what for and there not showing up on diagrams.

There may be extra wires you don't need. The basic set of wires on the radio is 4 pairs of colored wires--one black-striped and one plain for each speaker. Yellow is usually accessory power, red is hot, and black is ground. Some additional wires may be one for a power antenna, one for an external amplifyer, and one for facelight (in case it will run on dimmer)
The car should have the following corresponding wires:
Radio 12v--- orange
Radio Ground--- black
Radio Ignition--- yellow
Radio Illumination--- brown
Dimmer--- gray
Power Antenna--- pink (if you have one)
LF Speaker +/- tan - grey
RF Speaker +/- lt green - dk green
LR Speaker +/- brown - yellow
RR Speaker +/- dk. blue- lt. blue

The car or radio could have additional connectors, such as for a subwoofer, CD changer, etc.

I put in a kenwood stereo in my car I ran the red wire to the yellow 12 amo wire on the ac control. Now my deck shut off ..my ac doesn't work anymore.. I checked fuses and relays.. idk what to do .