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I have an electrical nightmare going on with my 2011 GMC sierra and have been searching for wiring diagrams as well as information on the data communication lines amoung other things.  The only wiring diagrams for these trucks is what very little is in the up fitter pdf.  Every old post I find where someone asks for wiring diagrams they're referred to the GM up fitter site but that only has a few diagrams that only pertain to adding accessories pretty much.  I find it extremely odd that there is no resource with a service Manuel for a 2011 sierra! 

Posted

Omg thank you guys!! I admit I used to be good with searching for things online but the gmupfitters website is horrible for me.  

 

Doing some late night forum reading last night I actually found the charm.ii website!  That is great and I actually fell asleep with my laptop in bed looking at it! Lol  I had almost gave up reading and said I'll go to one more page then that's when I found the charm website.  

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