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This is what I think I need to do.

Yes the fans works perfectly, putting either low or high pin leads to ground.
Yes in the 2007-2010 trucks they use an 80 pin plug and use pins 17 and 58 for low and high relay fan control.
Looks...

I was able to obtain a wiring diagram from my local dealer now all I need is a screen shot of what to program in the ECM.

I have installed both high and low fan relays and fuses. I am currently using an aftermarket fan harness that bypasses all of that. I would love to have this install completely factory. do you know...

Did you use pins 17 and 58 and did they pull to ground?
I seem to have several fan choices also what did you use?

I am doing an electric fan conversion on my 2009 silverado 2500HD. I am using factory GM dual fans from a 2008 silverado 1500 with a tow package.
I have identified pin 17 and pin 58 for low and...