1990 gmc 3500 radio HELP

Dtrom
10+ year member

MAF
doing a head unit install on one of these trucks as we speak. Can't locate the front speaker negatives and positives. Does anyone know what color these might be? The diagrams I'm looking at shows colors that aren't even in the factory wiring. Need help asap thanks.

 
can you take a picture of the harness the actual vehicle harness
Thanks for your help but we got it figured out now //content.invisioncic.com/y282845/emoticons/thumbsupwink.gif.129404938effda6ad9cca39e7f4b58a3.gif

 
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