newbie with car audio knowledge
1984-87 Buick Regal Stereo Wiring
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here is a break down of your stereo diagram just in case, pull the radio and make sure you don't have a loose wire behind the radio and if it's an aftermarket you may check your connections. I'm sure it's deeper then that if it's doing all that but atleast you'll know things are ok behind the radio. I don't know how to tell how the correct procedure is to tell if you have a short, but i know you'll need a 12 volt lite. You may need this and you may not but i thought i would try and help cover the area i know. If it's grounding out behind the radio then that may be the problem. doesn't hurt to check it.
good luck.
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( 1984-87 Buick Regal Stereo Information )
1984-87 Buick Regal Stereo Wiring
Constant 12V+ Orange
Switched 12V+ Yellow
Ground Black
Illumination Gray
Dimmer Brown
Antenna Trigger Pink
Antenna Right Front
Front Speakers 3 1/2" Dash
Left Front (+) Tan
Left Front (-) Gray
Right Front (+) Light Green
Right Front (-) Dark Green
Rear Speakers 4" x 10" Rear Deck
Left Rear (+) Brown
Left Rear (-) Yellow
Right Rear (+) Dark Blue
Right Rear (-) Light Blue