Audio wiring colors

Hopefully you have not cut off the factory radio plug. Go to any store that sells car audio and buy the adapter harness for your car. The wire colors will then match up.

Also check if if power has on the back of the red wire if not run a wire straight from the bat to the red wire in back of the altenator if you hear a change on the rpm it's charging now possible broken fuse able link

get some quality wire connectors and match color for color.

A cheap way is to buy a stereo adapter for your vehicle.It shows the wiring diagram.This adapter is when you are replacing the radio with an aftermarket one

Not sure I understand your question. Did you buy a harness adapter for GMC, or are you trying to just cut the connector off the factory radio and solder it to your CD player? If the latter, below is the color code for your factory wiring.

1994 GMC Sierra C1500 Car Radio Wiring Schematic
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: N/A
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

Generally, the way I put an aftermarket cd-player in, is to use a new 'harness adapter' that connects to the old harness and has all of the wires color coded and labeled for easy installation of a new radio using wire nuts. I wouldn't try to cut into the existing harness, without knowing what was what.

What's the 'little plug thing' off of the grey wire?

see an auto sparks ,or take to a local radio fitting shop ,no good telling me here because colours of wires can vary between manufacturers of both the radios and the vehicles

whoop! there it is!
1994 Ford Probe Car Radio Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Blue/Red
Car Radio Accessory Switched 12v+ Wire: Blue/White
Car Radio Ground Wire: Black/Pink
Car Radio Illumination Wire: Orange
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: Light Green/Yellow
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 (+): Blue/Green
Left Front Speaker Negative Wire (-): Blue
Right Front Speaker Positive Wire (+): Blue/Black
Right Front Speaker Negative Wire (-): Blue/Orange
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 (-): Green/Orange
Right Rear Speaker Positive Wire (+): Green/Yellow
Right Rear Speaker Negative Wire (-): Green/Blue
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the easiest way to install a new radio is to get the wiring harness adapter for your vehicle it runs about $25 and then you do not have to cut the factory harness. the wiring codes will come with the new harness and is just matching up there color code to the new stereos color code.

If you are replacing the factory radio just get a wire adapter, wire it to you radio and plug in. I don't recommend any other way unless someone already cut the plug. If so just stop at your usual mechanic and ask for a wire diagram I know I would give one to my customers.