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Re: Newer GM radio in 1975 GMCPosted by John Van Valkenburgh on June 23, 2004 at 04:41:27 from (216.187.239.226): In Reply to: Newer GM radio in 1975 GMC posted by db on June 22, 2004 at 21:43:40:
Try this site: Click on GM/Saturn and it will open an Adobe Acrobat file that shows various pinouts. I'm guessing the extra wire on the Digital radio is power for the Electric Antenna. Usually provides power when the radio is turned on. Good luck,
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