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My car radio switched 12+ wire: yellow is only putting out 6.5-7 volts when I turn it up it goes down to 5v. When this happens my radio freaks out, stops playing, and makes a high pitched squeel. I turn my car off and the voltage stays the same and keeps making the high pitched squeel even with no actual power goin to the radio. When I turn car back on it makes an even higher pitched squeel and then goes back to kinda normal. By that I mean the 6.5-7 volts. It will keep doing this every time I turn my radio up to listening volume. Is there any way to get the wire back to 12v or a way to splice power onto the yellow wire from another wire? Like the orange constant? Please help


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contributions: 1966
Images: 37
Location: Oregon
Are you sure the yellow wire is supposed to be 12V? From the wiring diagram I show that there are two yellow wires from the radio. One goes to left rear speaker from pin B9 and the other one goes to the steering column switches from pin A6.

does your radio have the factory separate amplifier in the trunk?

most of the time when the radio outputs static or squelch noise it's a bad radio.

you could use a scanner and see if you have any "U" or "B" codes.


   
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2002 Oldsmobile Alero Car Radio Stereo Audio Wiring Diagram
Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger: Dark Green
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

That is the diagram that I found Originally but I did find the diagram that you were talkin about.

No my vehical dose not have a factory amp in the trunk.

I was thinking the same thing but I didnt have another radio to test it with Or a scanner at the moment to test it either. Im having a friend with a scanner come over later thos week to check for those codes.


   
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contributions: 1966
Images: 37
Location: Oregon
here's what I have for wiring. the yellow wire that goes to the steering wheel switches may be a 12V circuit but it goes through the resistors in the steering wheel so I don't know what readings you will get unless you unplug the wiring connector to the clockspring coil


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