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Colored plugs on back of under hood fuse panel.

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Hey! I have a 2001 GMC 2500 that used to have a 6L gas in it, but is in the midst of a 12V swap. When I was gutting the engine bay I noticed that the plugs on the back side of the under hood fuse panel are color coded. Was just curious as to what the colors stand for. There is green, red, black and white. I found this picture on google to better explain what im getting at. Any ideas on the colors would be appreciated. Thanks.



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