I'm trying to connect a remote wire to the harness of an original stock radio need to know which wire to attach it to the vehicle is a 2005 chevy cobalt coupe

Here are the wire colors and their corresponding functions for the three OEM radio plugs in a 1993 Chevy C1500:
Plug A:

• Yellow: Battery
• Red: Ignition
• Black: Ground
• Gray: Illumination
• Brown: Dimmer
• Light Green: Left Front Speaker (+)
• Tan: Left Front Speaker (-)
• Dark Green: Right Front Speaker (+)
• Light Blue: Right Front Speaker (-)

Plug B:

• Orange: Constant 12V+
• Yellow: Switched 12V+
• Black: Ground
• Gray: Illumination
• Brown: Dimmer
• Light Green: Left Rear Speaker (+)
• Dark Green: Left Rear Speaker (-)
• Brown/White: Right Rear Speaker (+)
• Yellow/Black: Right Rear Speaker (-)

Plug C:

• White: Left Rear Speaker (+)
• Gray: Left Rear Speaker (-)
• Purple: Right Rear Speaker (+)
• Green: Right Rear Speaker (-)

Note that the wire colors may vary slightly depending on the specific year and model of the vehicle, as well as any modifications that may have been made to the wiring harness. Also, keep in mind that it's important to properly match the wires from the harness to those on the radio to ensure proper functionality and avoid damaging the radio or other components in the vehicle.

read (you meant main harness to radio sub harness.)
and car may have 5 or more harness for 5 or more very complex radio head end options new,so only the real service manual covers all that for sure,or if lucky 2nd fiddle here.

https://eautorepair.net/Marketing/Default.asp

You will need to splice the wires as it will be hard to find the right connector to attach to the harness wires. Use the wiring diagram for the car (get it at Alldatadiy.com) and the one that came with the Dual unit to figure out which wires connect to each other.

The motorolla box may be remnants of an old disk changer for the stereo. With an amp your power wire goes into the positive wire that goes to your battery, your ground wire will be connected to some bare metal close to wherever you decide to install the amp, and the blue remote wire will be connected to the remote wire that in on the wiring harness of your aftermarket radio ( I'm sure your not installing an amp with your stock radio). Good luck I hope this helps

there are 100's of replacement radios for vehicles, what you need to keep in mind is,,, if your factory radio has the vehicle info on the radio screen, its connected to the computer and all that goes along with it, I have an 02 Malibu, and had a new radio installed, But they had to route wiring to the trunk, ( thats where they put the factory radio and wired it in ) so that all my factory functions still worked, I was a little displeased with Chevy for having this attached to a radio, and since the CD player stopped working in the original, I was able to purchase a new radio, amp , and have it and the old one installed , rewired, and it still cost me less than Chevy wanted for a replacement of the old radio, Just due to the CD not working, so be sure and check around when looking for a replacement,

you can find an adapter that installs between the factory harness on the car and the type of radio you are installing,so you don`t have to cut and splice,you just have to unhook the original radio and install the harness to the original harness and connect the other end to the radio your installing and your done.you can find these at most radio and accessory stores.

You'll need to remove the stock radio from the vehicle and look on the back - if it doesn't have a fuse there, then the radio probably burnt inside. The cost of repairing the original radio may be more than buying a replacement. When you get your replacement, make sure to buy the appropriate wire harness for your vehicle as well as the right mount kit for proper installation. If you do the stereo but don't mount it , it will not last long as it doesn't take much banging to kill one. Patience will be your best tool in doing this job as well as minimal tools including a crimp tool and crimp connectors. Soldering the wires is not necessary, and when you get the harness, count the wires on it - that is how many connectors you'll need, although I would get a few extras - for insurance!!

THIS IS A COPY OF A POST I SUBMITTED TO SOMEONE WHO HAD A SIMULAR QUESTION REGARDING AN ALPINE BRAND RADIO ISTTALLATION. THE PROCESS IS THE SAME NO MATTER WHAT BRAND THE AFTERMARKET RADIO IS.

Go to the store and buy a mounting kit and wiring harness adapter that are for your car. There are alot to choose from and most are universal and come with instructions. You can get these at wal-mart or best buy. The mounting kit is meant to fill in the empty space left by the new aftermarket radio (your alpine). The alpine will have a metal sleeve around it. take this off and put it in the mounting bracket so it is flush. The sleeve will have little triangle shaped tabs on it. Bend these out so the sleeve cant fall out of the bracket or someone will be able to pull out your radio. Remove your stock radio by pulling off the trim around the radio. This is held on by clips, so be careful. There will be a couple of screws holding in the radio. Remove these and pull the radio out. Behind the radio there will be 1 or 2 wiring harnesses plugged into the radio. Unplug these. Then attach the wiring harness adapters you bought. These plug into the stock harness and have wires at the other end that are labeled. Wire the alpine wiring harness into the harness adapters that you plugged into the stock harness. If you want to you can unplug the harness from the alpine and wire it to the harness adapter before plugging it into the stock harness. The wiring diagram should be on the radio. If not the colors are pretty common.
RED = SWITCHED PWR LEAD (IGNITION)
ORANGE = ILLUMINATION
BLACK = GND
YELLOW = BATTERY LEAD
GREY = FNT SPKR RIGHT(+)
GREY/BLACK STRIPE = FNT SPKR RIGHT(-)
WHITE = FNT SPKR LEFT (+)
WHITE/BLACK STRIPE = FNT SPKR LEFT (-)
VIOLET = REAR SPKR RIGHT (+)
VIOLET/BLACK STRIPE = REAR SPKR RIGHT (-)
GREEN = REAR SPKR LEFT (+)
GREEN/BLACK STRIPE = REAR SPKR LEFT (-)
BLUE = PWR ANTENNA LEAD
BLUE/WHITE STRIPE = REMOTE TURN ON LEAD(FOR SUBWOOFER AMPLIFIER)
There may be RCA jack inputs in the back and these are for the subwoofer amp.
There will be a large black cable in the back and this is the antenna wire. Plug in the antenna wire from the back of the stock radio here. Yu may or may not need an adapter for this depending on the size difference between the wire and the hole it plugs into.
**Please note: if your car has a "premium" sound system that comes stock with an amplifier you will need to attach the power antenna lead from the alpine to the remote turn on lead on the harness adapter. If not when you turn on the radio/cd it will not turn on the stock amplifier and the speakers will not work.
I found this out with my 99 dodge avenger which has an Infinity stock radio. You can pop the trunk and look up at the back dash and see the small amplifier.
Once the radio is wired and the mounting bracket is installed, connect the harness adapter as well as the antenna wire. The new wiring harness adapter makes the wiring a little longer so you may have to stuff them back a little bit. Connect the harness from the alpine back into the back of the radio and slide the head unit into the metal sleeve until you hear a click. Before sucuring the mounting bracket and putting the trim back on it is a good idae to try the radio out so if there is something wrong you dont have to disassemble it again. When you buy the harness and bracket it will say on the packaging "nissan 84-94" or "Honda 83-99" or something similar. Look on the back for a complete list of compatable models

please vote and thank you!

Stereo Wiring
Constant 12V ..................................................Orange Switched 12V ................................................. Yellow Ground Black Illumination.....................................................Gray Dimmer............................................................Brown Front Speakers 6 1/2" Doors Left Front ( ).......................................................Tan Left Front (-)........................................................Gray Right Front ( )......................................................Light Green Right Front (-).......................................................Dark Green Rear Speakers 6 1/2" Rear Doors Left Rear ( )...........................................................Brown Left Rear (-)............................................................Yellow Right Rear ( )..........................................................Dark Blue Right Rear (-)...........................................................Light Blue
First of all, the Bose amplifier needs to be activated when the after-market head unit is turned on. This is done by connecting a activation wire (often called a "remote" wire) in the factory radio plug. Usually this is a dark green or orange wire in the main radio plug, but in Onstar-equipped vehicles, the remote wire may be pink or orange in the smaller, secondary plug. In either case, the wire must be connected to the blue/white remote output from your new head unit, in order for the Bose amplifier to turn on.

This is because you need to purchase the aftermarket-oem harness plug.This harness plugs into your original equipment radio harness and allows you to plug any aftermarket radio into the stock deck wires.After you plug the harness in you can then connect the radio wires together.Your local autoparts store or circuit city or best buy or audio express will have these radio conversion plugs.I hope I could help