GMC trailer connector pin assignment

Can any one give me a URL that will show the pin assignment for a trailer connector? I used to use ALLDATA but now I see they want money, even for one simple question. :-(
Thanks for help on this question.
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wrote:

Check out "how to" link below for starters
http://www.popularmechanics.com/how_to_central/automotive/1272556.html ----------------- TheSnoMan.com
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Useful info here:
http://www.marksrv.com/wiring.htm
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