VT S Commodore stereo wiring problem

Question edited for clarity.
Question moved to Holden Commodore.

All in this link.

https://www.google.com/search?q=holden+commodore+vz+stereo+wiring+diagram

..

i just took wires out of a car that used to have a amplifier and they where one small light blue and one black i dont know if that helps any

He may have to get underneath the dashboard and see if their is a security strap or wire harness holding the radio into the mounting sleeve. It's common for installers to strap down the stereo to prevent thefts and other installer from easily taking the radio out. Have him keep trying.

There should be a wire in the factory harness that turns on the infinity amps. If you used an aftermarket adaptor harness it should have a blue or a blue white wire in it, or both. When this wire, or wires receive 12V, the factory amp will turn on. this will need to be hooked to the aftermarket stereos blue wire.

head down to your local auto store and you will be able to pick up a wiring harness adaptor. you wire your stereo to this adaptor then you simply plug it into the wiring loom. no damage to the loom so if you ever need to reinstall the standard stereo its just an unplug and plug back in. its extremely simple and colour coded so there are no mistakes.

there should be a remote wire for your amplifier on the back of your stereo if you have an aftermarket stereo. It's usually a blue wire, if not you can always hook it to the same remote wire as the one your stereo is running off of.

did not install anything.

iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Here are the wiring codes for the VT,
VN-VT Commodores:
Accessory (12V) Yellow
Battery (12V) Orange/White
Ground (earth) Black/White
Antenna power (12V) Yellow/Red
Front Left + Tan
Front Left - Grey
Front Right + Light Green
Front Right - Dark Green
Rear Left + Brown/Black
Rear Left - Yellow/Blue
Rear Right + Blue/Orange
Rear Right - Blue/Black

Antenna Up White (VR-VT)
Antenna Down Blue (VR-VT)
Phone Mute Yellow/Black (VT)
Dimmer In (12V) Brown/White
Dimmer Out (12V) Grey (VT)

Was it working before?

I would hate to have you crack it open when maybe the ground wires arent hooked up right. Unless you have a scope go online and get the manual on wiring it to ensure you did it right.