None of the 1g fan wiring write-ups I read enabled both fans to run while retaining the AC compressor in the "OFF" position. I actually use my AC so I needed a quick and easy way to run both fans without the compressor running.
With this easy 1-wire jumper mod both fans will run with the Ignition switch, and it will not engage the AC clutch. No running wires in the cab, no switches required.
dsm-article1.mp4 - YouTube