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Old 11-12-2006, 09:36 PM   #1
bojoe
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Radio Wiring Diagram

I am putting in a new radio in my '85 GMC. Does anyone know where a color coded wiring diagram can be found? Everything about this truck is factory. The AM/FM that was put in new in '85 just came out for the first time today. So I can assume that the wiring has been untouched.
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Old 11-12-2006, 10:49 PM   #2
magnethead
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Re: Radio Wiring Diagram

what part do you need? Yellow is constant battery (memory), red is ignition on, black is ground. It's fairly straightforward, you can look in the door jambs for wire colors, typically the one with the black stripe is the negative side.
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Old 11-13-2006, 12:44 AM   #3
evan
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Re: Radio Wiring Diagram

This is out of the Haynes manual.

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Old 11-13-2006, 10:52 AM   #4
bojoe
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Re: Radio Wiring Diagram

Thanks for the help. I was too lazy to take everything apart to find where everything went to. I had bought this nice Kenwood to go in the truck and it doesn't work or every speaker in the truck is junk. I don't want to cut out the dash to make a newer square radio work, so I will find another radio somewhere.
__________________
  • 1985 GMC 1/2 ton 305/700R4
  • 1975 Chevrolet 1/2 ton 350/350
  • 1971 Chevrolet C-60 427/5+2
  • 1981 Cadillac Deville 6.0/368cid
  • 2003 Chevrolet Suburban(wife's ride)
  • 2007 Peterbilt 379/How I make money
  • More old John Deere tractors than I know what to do with.
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Old 11-13-2006, 07:33 PM   #5
magnethead
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Re: Radio Wiring Diagram

does the faceplate display come on? If so, take a 9 volt battery and tap each speaker wire pair to it- speakers don't like DC current, but for testing it works.
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Old 11-14-2006, 02:33 PM   #6
CLASSIC87'
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Re: Radio Wiring Diagram

Quote:
Originally Posted by bojoe View Post
Thanks for the help. I was too lazy to take everything apart to find where everything went to. I had bought this nice Kenwood to go in the truck and it doesn't work or every speaker in the truck is junk. I don't want to cut out the dash to make a newer square radio work, so I will find another radio somewhere.
If you are looking to installing an aftermarket radio... invest in a harness adapter for approx. $10.00. They plug into your factory plug and very simple to install... and saves you A BUNCH of time. You can find them at you local Autozone...

Anthony
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