You have it right. Use a 12 volt test light to see if there is power between the gray and brown wires when the key is on. If there is power there, you may have got hold of a bad radio.
1990 Toyota Celica Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Blue/Yellow, connects to yellow
Radio Switched 12V+ Wire: Gray, connects to red
Radio Ground Wire: Brown, connects to black
Radio Illumination Wire: Green, do not use
Radio Dimmer Wire: N/A
Radio Power Antenna Trigger Wire: Black/Red
Radio Amplifier Turn On Trigger Wire: N/A
Front Speakers Size: 4? Speakers
Front Speakers Location: Dash
Left Front Speaker Wire (+): Pink
Left Front Speaker Wire (-): Purple
Right Front Speaker Wire (+): Light Green
Right Front Speaker Wire (-): Blue
Rear Speakers Size: 5 1/4? Speakers
Rear Speakers Location: Side Panels
Left Rear Speaker Wire (+): Black
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Red
Right Rear Speaker Wire (-): White
Got the volt meter, and no power is going to the blue/yellow or gray wires. Checked the fuse again and it's good. Even tried grounding the volt meter on the frame, not just using the brown wire. Is there possibly something that has been un-hooked that would cause this or am I going to need to re-wire things?
check to see if there is power at the fuse. If there is power at the fuse, run a new wire from the fuse box. If no power at the fuse, either the fuse box is bad or the feed from the ignition switch is bad. Are all the other accessories working?
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I had the same problem. What I did was grounded the radio to the car (not by the brown wire), ran a wire from the battery to connect to the constant. Keep the gray (acc) wire hooked up as it should be, and works fine now. Somehow the blue/yellow wire broke somewhere, fried, I don't know, but that was the problem for me.
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